Despite spending 175 of the season’s 182 days atop the NL East, building a 10.5-game lead by the end of May, and winning 101 games, the New York Mets lost out in the division race to a red-hot Atlanta Braves team that has played at a .696 clip since the start of June — and lost out via a tiebreaker, a 10-9 season series disadvantage. Now they’ll have to take the long route through the new postseason format, one that includes a potential matchup with the top-seeded, 110-win Dodgers if they advance beyond the Wild Card Series.

That can’t be taken for granted. Even with Max Scherzer and Jacob deGrom available to start in this best-of-three series, all of which will be played at Citi Field, they can’t overlook the Padres, who can offer some top-notch starting pitching themselves and who beat the Mets in four of the six meetings between the two teams. Not that such results are predictive — and it’s worth noting that the aforementioned pair combined for one start in the six games (Scherzer in a 4-1 loss opposite Yu Darvish on July 22) — but they do illustrate the range of possibilities here. The ZiPS Playoff Odds pegged this as the biggest mismatch of the Wild Card round, narrowly edging out the Mariners-Blue Jays series, but with the Padres still having a 42.4% chance of scoring an upset.

Both deGrom and Scherzer looked all too human last weekend during the Braves’ division-s(t)ealing sweep, combining to allow five home runs and seven runs in 11.2 innings. If there’s good news, it’s that manager Buck Showalter didn’t have to send deGrom to the hill in Game 162 in hopes that the Mets would win and the Braves would lose, because that would have ruled him out of the Wild Card round had they lost. Read the rest of this entry »

Once upon a time, mid-September brought my annual check-in on the potential for end-of-season chaos in the playoff races via my Team Entropy series. With the new Collective Bargaining Agreement and the restructured postseason, however, Major League Baseball has done away with tiebreaker games and the scheduling mayhem that they could cause in favor of greed a larger inventory of playoff games. Along with the expansion of the playoff field from 10 teams to 12 and the Wild Card round from a pair of winner-take-all games to a quartet of three-game series, MLB did away with all winner-take-all regular season tiebreaker games. In the name of efficiency, we have no more Game 163s. Instead, ties will be decided by the excitement of… mathematics. Boooooooo!

The untangling of the often-complex scenarios by which those tiebreakers could come about was Team Entropy’s raison d’etre, though we were able to make do in 2020, when in the name of minimizing travel and keeping the schedule compact to accommodate an expanded field, MLB similarly opted to dispense with the on-field tiebreakers. That wasn’t nearly as much fun, but at the very least, it feels appropriate to sketch out what’s at stake while pouring one out in memory of what’s been lost.

As you’re probably aware by now, each league’s playoff field will consist of six teams, namely all three division winners plus three Wild Cards with the best records from among the remaining teams. The top two division winners by record get first-round byes, while the third division winner (no. 3 seed) plays host for all three games against the third-best Wild Card team (no. 6 seed) and the top Wild Card team (no. 4 seed) hosts all three games against the second-best Wild Card team (no. 5 seed). Read the rest of this entry »

This is Chris’ first piece as a FanGraphs contributor. Chris is a data journalist based in Boston. He started his career working in baseball, first as a media relations intern with the 2014 Cubs and then with the Red Sox media relations department from 2015 to ’19. In addition to thinking about baseball, he reports on data topics ranging from education to climate to COVID-19 for U.S. News and World Report. Chris has long used FanGraphs to describe what data journalism is to confused friends and family.

The baseball fan’s proposition is a delicate balance. We’re asked to tune in for 162 games that are of relatively little individual importance to the team’s World Series chances, an act of faith anchored somewhat in the premise that “anything can happen” in the postseason. If your team is able to survive the regular season grind, the game assures you, they have a shot to bring home the ultimate reward.

But with less than three weeks to play, the 2022 regular season is looking a little flat from a competitive standpoint. The playoff field, with its new three Wild Card structure, is looking relatively set, and this year’s regular season is shaping up to have been, well, mild when it comes to non-home run chase drama. Read the rest of this entry »

Since I’m an obnoxiously determined Devil’s advocate, one of my favorite uses of data is tackling conventional wisdom. For example, one such bit of wisdom that always bugs me is when pundits insist that the best teams are the ones that win close games. In fact, the opposite is true. The most predictive run differential comes in blowouts — the good teams are the ones that are more likely to humiliate their opponents, not squeeze out a close one. This time of year, you start to see a lot of analysis asserting that X team is definitely blessed or doomed come playoff time because of some randomly chosen factor Y. We could do a column a day on these and still have dozens of unwritten pieces by the time the actual playoffs roll around, but let’s focus on a few specific ones, concentrating on who good teams beat rather than how many games they win.

First off, do regular season head-to-head records matter in the playoffs? Since the start of divisional play in 1969, teams that face each other in the playoffs have frequently met in the regular season. Interleague play added eventual World Series matchups to the regular season, and starting in 2023, every playoff matchup will have already occurred during the regular season. Given the sample size of playoff series, if we construct a simple model of series winning percentage that only consists of a team’s regular season winning percentage and its winning percentage in head-to-head matchups, the model horribly inaccurate, with an r-squared of 0.0886 and a mean absolute error of 275 points of winning percentage.

But including head-to-head winning percentage doesn’t really even have a marginal influence on the coin flip; without the head-to-head matchups, the model’s MAE increases to 276 points of winning percentage. Now, a head-to-head record may imply something about a team’s overall strength that isn’t captured in its overall record, but rather than pick up a small sample implication, we can use strength of schedule directly, which does help the model a tiny bit (playoff series are always going to be very uncertain unless we move to best-of-75 series or something wacky). Read the rest of this entry »

Speculating about the playoffs in August always feels strange. The regular season isn’t over. It isn’t nearly over, either – the 45 or so games remaining on each team’s schedule will change how we think about them. The best two records in baseball belong to the Los Angeles Dodgers and the Houston Astros right now, but some team could go 35-10 and wrest that title away from them.

Still, today I’m going to speculate about the playoffs. Whether the Dodgers and Astros hold onto their top spots or not, they’re both playoff locks – our Playoff Odds give them both 100% odds of reaching the postseason. In the past week, they’ve also each gotten rotten injury news that will affect their playoff rosters. So suspend your inherent skepticism of articles in August that talk about October as we consider the playoff impact of losing Walker Buehler and Michael Brantley. Read the rest of this entry »

The delayed start to the 2022 season due to the lockout has had a lot of small consequences for the structure of the season, ranging from expanded rosters to my least favorite thing, the continued use of zombie runners in extra innings. The last (we hope) of these changes is a slight alteration to the playoff schedule, which the league sees as a necessity in order to keep the postseason from straying too far into November. On Monday, MLB announced that the three-game Wild Card Series will be played without any off-days, while an off-day will be trimmed from the Divisional Series (between Games 4 and 5); teams in the ALDS get one additional off-day, without travel, between Games 1 and 2. The Championship Series will lose an off-day between Games 5 and 6). The World Series is business as usual.

While I expected this configuration for the Wild Card round (it was already accounted for in the generalized ZiPS projections for postseason performance), there are some slight tweaks that need to be made to account for the changes to the Division and Championship Series with respect to pitching. When projecting the roster strength of a team for the purposes of postseason probabilities, ZiPS weighs pitchers at the top of the rotation more heavily. That’s because historically they have gotten a larger percentage of starter innings in the playoffs than during the regular season. But losing an extra day of rest could result in teams using the pitchers after their No. 3 starters more heavily, as well as more dilemmas involving bringing back a top starter on three days rest. There are also possible consequences for the bullpens. In other words, teams will need to be slightly deeper than normal this playoff season.

So, how do we account for that? To get a rough estimate — I’m not sure there’s a methodology that will let us do any better than that — of the potential effects of the compressed schedule, I went back into the ZiPS game-by-game postseason simulations and put together a new, quick simulation for starting pitcher usage. I used projections as of Tuesday morning. Read the rest of this entry »