In a post yesterday, I wrote about the BaseRuns approach to estimating team winning percentages and how it attempts to strip away context that doesn’t pertain to a team’s actual ability, so as to reveal what would have happened if baseball were played in a world not governed by the whims of seemingly random variation. In this world, a win-loss record truly represents how good a team actually is. Try as it might, the BaseRuns methodology fails to actually create such a world, sometimes stripping away too much context, ignoring factors that do speak to a team’s quality, or both.

I delayed for a separate post (this one!) a deeper discussion of specific offensive and defensive units that BaseRuns represents quite differently compared to the actual numbers posted by these teams. To determine whether or not BaseRuns knows what it’s talking about with respect to each team, imagine yourself sitting in the audience on a game show set. The person on your left is dressed as Little Bo Peep, while the person on your right has gone to great lengths to look like Beetlejuice. That or Michael Keaton is really hard up for money. On stage there are a series of doors, each labeled with a team name. Behind each door is a flashing neon sign that reads either “Skill Issue!” or “Built Different!” Both can be either complimentary or derogatory depending on whether BaseRuns is more or less optimistic about a team relative to its actual record. For teams that BaseRuns suggests are better than the numbers indicate, the skill issue identified is a good thing — a latent ability not yet apparent in the on-field results. But if BaseRuns thinks a team is worse than the numbers currently imply, then skill issue is used more colloquially to suggest a lack thereof. The teams that are built different buck the norms laid out by BaseRuns and find a way that BaseRuns doesn’t consider to either excel or struggle. Read the rest of this entry »

You’re probably familiar with the saying, “Happiness equals reality minus expectations.” Maybe because your Aunt Debbie shared a post from her favorite social media influencer. Maybe because you passed the time during a layover at the airport perusing the self-help books in the Hudson News near your gate. Like most self-help tropes, whether or not it hits for you depends a little on your life circumstances and a little on how you choose to apply it. When it comes to sports fandom, emotional hedging can be a useful tool to avoid disappointment, or maybe you prefer projecting confidence to manifest a desired outcome. And if you’re a Phillies fan, you’ve perfected the art of oscillating wildly between the two over the course of a single game. You even have a handy meme with a meter that only ever points to one extreme or the other:

(Please excuse the mismatched needle sizes and logo alignment. These images are precious internet relics that have been downloaded, clumsily edited, re-uploaded, compressed, and decompressed hundreds, if not thousands, of times. The pixelation is earned like callouses on the hands of a skilled laborer.)

But the formula seems to assume that expectations are set and controlled by the person in search of a happy existence. The entire notion is upended when mathematical models based on historical outcomes become the source for baseline expectations. In this scenario, if your team is outperforming expectations, then you can enjoy the banked wins, but you do so in fear of the rainier days that surely lie somewhere in the team’s future forecast. Whereas if your team is underperforming expectations, things might feel dire, but there’s reason to believe sunnier days lie ahead. Read the rest of this entry »

A couple of weeks ago, Hannah Keyser of The Bandwagon asked Kodai Senga about his reverse splits when it comes to times through the order. His .347 wOBA allowed the first time through the lineup drops to .275 the second time through it, and then sinks to .205 the third time through. However, his total batters faced sits at just 90 for each of the first two times through the order and 48 for the third time through. That’s a small enough sample that it’s difficult to say how much of the credit goes to Senga and how much is naturally occurring variation.

Either way it doesn’t matter much to Senga, who cares more about process than results, “Quite honestly, I don’t feel like I’m very good at any point during the game this year,” he told Keyser through his interpreter. Harsh words for a pitcher with an ERA- of 37. He does acknowledge that he makes adjustments throughout the game to get a better feel for his pitches and tweaks his strategy based on how each pitch is looking in a given start, which offers some explanation for the improved outcomes as the game goes on. But according to Senga, all of his pitches feel off this year, as he remains in the process of re-establishing his mechanics following the shoulder and calf injuries that sidelined him for nearly all of last year.

Senga’s self-evaluation reminds us that folks performing at the elite level of their fields don’t get there by letting good enough be good enough, but rather by insisting that nothing is ever good enough. To the layperson, it’s baffling to hear that Senga feels he’s pitching worse, despite posting better results than in 2023, his first MLB season, and the last in which he was fully healthy. Add on that he somehow manages to gain effectiveness throughout his starts despite a certain level of displeasure with all of his pitches, and it couldn’t be any clearer that regardless of what you read in Us Weekly, the stars are not actually just like us. Read the rest of this entry »

At one point or another, most of us have done the thing where we go to the refrigerator in search of a snack, decide nothing looks appealing, close the door, then come back 15 minutes later to check again and somehow feel annoyed when the contents remain unchanged. It’s a near-universal experience despite the illogical nature of the whole thing. And when we relate this experience to others, it’s always the refrigerator, even though we could just as easily choose to re-check a cabinet or the pantry. But I think this is where we do get some credit for being slightly logical. The contents of a refrigerator are far more transient than the dry and canned goods stored elsewhere in the kitchen. The fridge is where we keep the perishables, the food that by definition isn’t meant to last long. Food in the refrigerator comes and goes, rots and gets tossed, all at a much faster rate than elsewhere in the kitchen.

Park factors work a little like a refrigerator. They present a single value that contains within it the influence of several different components that vary from park to park, much in the way my refrigerator is two-thirds beverages and cheese, while yours probably has fruits and veggies and maybe some leftover ham from Easter that you should definitely throw away. Some of the components captured by park factors are static and easily measured, like surface dimensions and wall height. They’re the condiments that remain consistently stocked in the fridge door.

But sometimes you throw open the door to a park’s refrigerator and get whacked in the face with a stench of unknown origin. And that stench becomes all the more potent as it mingles with a to-go box of leftover Thai and a carton of milk growing more questionable by the day. Likewise, wind speeds, the daily dew point, and the angle of the sun at different points relative to the solstice all fluctuate and interact in a way that a scientist with the right expertise could tease out and quantify, but that remain a bit fuzzy to the casual observer.

It was these squishier components of park factors, the ones that ebb and flow as weather cycles in and out and the seasons change, that sparked my curiosity about how park factors might vary over the course of such a long season. Traditionally, park factors are calculated over multiple full seasons of data (though sometimes single-season park factors are useful for capturing more recent trends), and that’s not just a sample size consideration. A full season of data is needed to ensure a balanced schedule where every opponent faced on the road is also faced at home and vice versa. This ensures that when comparing runs per game at home to runs per game on the road, the team quality is consistent in both subsets. Read the rest of this entry »

On April 16, Jackson Holliday ended an 0-for-17 slump with a second-inning grand slam that put the Orioles up 4-0 in an eventual 9-1 win over the Guardians. But a commanding win wasn’t the only momentous occasion taking place at Camden Yards that evening — it was also Bark in the Park night. When asked in his post-game interview if there were any furry friends he’d like to shout out, he replied, “Oh yeah, Coconut’s here,” referring to the one year old Bernedoodle that Holliday and his wife added to their family during spring training last year. Coconut attended the game wearing Holliday’s jersey and acted as his good luck charm, though Holliday believes dogs beyond his own have the power to bring him positive vibes at the plate. “I have a good track record in the minor leagues of performing on Bark in the Park, so maybe we’ll have to have these more often,” Holliday continued. That is a claim simply begging to be fact-checked.

Over Holliday’s tenure in pro ball, he’s played in eight games where fans were encouraged to bring their pups to the park, five in the minors and three in the majors. In the minors, Holliday’s teams went 1-4, as he amassed 19 plate appearances with four walks, five strikeouts, two singles, two home runs, and four RBI. That’s good for a .266/.421/.666 slash line, which isn’t bad, but when you consider Holliday posted a .303/.443/.485 line in the minors, it’s really only impressive from a power perspective (Holliday’s slash line in big league Bark in the Park games is .222/.300/.500 with four RBI over 10 PA). Still, the home runs are clearly what stand out in Holliday’s mind, and given that he went deep just 23 times over 218 games in the minor leagues and is driving the ball over the fence even less frequently in the majors, it makes sense that those four-baggers would feature prominently in his memory. Especially since all three put his team in the lead.

Now, I will confess that I only checked Holliday’s home games for Bark in the Park events. As you’ll soon see, I did an absurd amount of manual data collection for this piece, but I drew the line at checking the theme nights for every minor league affiliate Holliday faced. Maybe he disappointed dog owners up and down the Mid-Atlantic as he posted monster numbers in opponent ballparks. We’ll never know. But Holliday’s assertion that he gets a leg up from the presence of his four-legged friends led to a broader research question. Are there other players who consistently outperform their typical production with all those good boys and girls in the building? Read the rest of this entry »

In 2023, the Braves didn’t just lead the league in basically every offensive category, they posted historic numbers. They followed up that performance with a more middle-of-the-pack showing in 2024. Some of that downturn can be classified as regression to the mean, while some of it was definitely injury-related, with key contributors such as Ronald Acuña Jr., Ozzie Albies, Sean Murphy, and Austin Riley missing large chunks of the season. Moving forward, those theories imply that a healthy Braves lineup should perform somewhere in between their historically great 2023 and their exceptionally mediocre 2024. So far, however, the 2025 Braves have posted a gaunt 82 wRC+ as a team, creating anxiety that 2024 wasn’t just an unlucky draw from the low end of the range of possible outcomes, but rather something representative of a new normal, an indication that the range of possible outcomes in Atlanta has shifted downward. Of course, it’s too early to say for sure, especially since Acuña hasn’t made his 2025 debut, but batted ball and swing data, as well as changes in opponent pitching strategy, may offer insight into how pitchers have regained the upper hand when facing the Braves’ lineup.

If the extreme discrepancy in outcomes between 2023 and 2024 really was just variation within the error bars around Atlanta’s true talent level, then we’d expect to observe some amount of luck (good or bad) in their batted ball outcomes, which would lead their expected stats to diverge from their actual numbers, but the table below indicates their expected stats align pretty closely with reality:

Read the rest of this entry »

Every year, most teams hold some sort of team bonding, social event during spring training. The specifics of the event vary from team to team, but frequently they include renting out a movie theater and showing some cloying, inspirational movie like The Blind Side, Cool Runnings, Rudy, or better yet, a documentary like Free Solo. Regardless of the team’s outlook on the year, the goal is to get the players amped up for the season and ready to compete on the field, even if the competition in question is for fourth place in the division.

But what if instead of taking the clichéd route, teams actually tried to select a movie that fits their current vibe, one that’s thematically on brand with the state of their franchise? They won’t do this because spring training is a time for hope merchants to peddle their wares, even if they’re selling snake oil to sub-.500 teams. But spring training is over now, the regular season has begun, and it’s time to get real. So here are my movie selections for each National League team, sorted by release date from oldest to newest.

If you’re interested in which movies I selected for the American League teams, you can find those picks here. Read the rest of this entry »

Every year, most teams hold some sort of team bonding, social event during spring training. The specifics of the event vary from team to team, but frequently they include renting out a movie theater and showing some cloying, inspirational movie like The Blind Side, Cool Runnings, Rudy, or better yet, a documentary like Free Solo. Regardless of the team’s outlook on the year, the goal is to get the players amped up for the season and ready to compete on the field, even if the competition in question is for fourth place in the division.

But what if instead of taking the clichéd route, teams actually tried to select a movie that fits their current vibe, one that’s thematically on brand with the current state of their franchise? They won’t do this because spring training is a time for hope merchants to peddle their wares, even if they’re selling snake oil to sub-.500 teams. But spring training is over. It’s time to get real. So here are my movie selections for each American League team, sorted by release date from oldest to newest.

Stay tuned for the National League movie lineup in a subsequent post. Read the rest of this entry »

In the not-so-distant past, the shortstop position was dominated by defense-first players who hit at the bottom of the lineup. Pitchers loved to see them coming because it meant they could mentally check out for a batter. Meanwhile, if a shortstop could hit, he probably played pretty clumsy defense. I find it a bit trite to declare anything a renaissance while it’s still happening, and I don’t have the historical baseball authority to do so anyway, but I do want to acknowledge how impressive it is that such a strong majority of the starting shortstops on this list can legitimately hit and defend. Well-rounded shortstops are no longer unicorns or “nice to have.” Well-rounded shortstops are the standard. Glove-only shortstops are the aberration. Read the rest of this entry »

Y’know that point in the last few rounds of every fantasy football draft when kickers and defenses start flying off the board? We’ve reached the MLB offseason version of that, when teams start making sure their bullpens are composed of relievers more akin to Brandon Aubrey than the Panthers’ defense. With the rush on relief pitching officially on, the Tigers and Mets both agreed to one-year deals with right-handed, back of the ‘pen types on Wednesday. Detroit signed Tommy Kahnle at a salary of $7.75 million for 2025, while New York guaranteed Ryne Stanek $4.5 million for his services this year, with another $500,000 available in incentives.

In 2024, Detroit’s starters threw 753 innings, while the team’s relievers nearly matched that number with 694 innings — a league-best mark for innings thrown among major league bullpens. Maintaining success while covering such a large quantity of innings is tricky business. “One of our great strengths last year was our ability to throw different looks at hitters and try to limit the number of times a hitter saw the same type of look or shape or slot in a given series.” Tigers GM Scott Harris told reporters after the Kahnle signing, “Tommy gives us a look we didn’t have.”

Alongside Kahnle, the main characters in the Tigers bullpen are likely to be right-handers Jason Foley, Beau Brieske, and Will Vest, with Tyler Holton, Sean Guenther, and Brant Hurter making up the left-handed contingent. Foley and Holton handled most of the late-inning, high-leverage work last year, with Vest and Brieske next in line to get crucial outs. Now Kahnle offers an additional option in close-game scenarios. And as one would expect from such a bullpen-reliant team, a full cast of contributors sits waiting in the wings, be they starters asked to handle a long relief role, such as Matt Manning, Ty Madden, and Kenta Maeda, or minor leaguers with options and big league experience, such as Brenan Hanifee and Alex Lange (who is working his way back from a season-ending lat injury). Read the rest of this entry »