If you watched any baseball at all this postseason, the topic of using starters as relievers probably came up. The Nationals used the tactic frequently, and the Cardinals, Dodgers, Braves, Yankees, Twins, Astros, and A’s all had at least one pitcher who was primarily a starter appear in relief. And when those pitchers came in, the same concern was always raised. “Hey,” the concern roughly goes, “this team should put the starter in at the beginning of the inning to put him in the best position to succeed.”

Teams mostly stick to this advice. But I’ve never been one to take rules like this for granted. After all, plenty of other baseball aphorisms turned out to be nothing but high-minded nonsense. Bat your best hitter third. Bunt runners into scoring position. Focus on batting average. The list goes on.

Some of those are nonsense. But there’s a kernel of logic to using only starters with a clean start to an inning. Starters are creatures of habit, with complex pre-game routines designed to get them to peak readiness just in time for the start of a game. Take them out of this environment, ask them to get ready on a moment’s notice, and they might not be completely up to speed when they step on the mound.

It’s not that starters can’t handle having runners on base, in other words. After all, starters pitch with runners on base all the time. Instead, the issue is that with runners on base, the first batter a pitcher faces is sure to be important. Could it be that starters simply aren’t throwing at 100% for the first batter they face when they’re coming into the game in relief?

To test this theory out, I looked at every instance of a starter pitching in relief in the playoffs over the last five years. It’s inherently a limited sample, but starters pitch in relief in the regular season in very different circumstances, and I deemed them different enough that the playoff data would be more relevant. I bundled mid-inning appearances and start-of-inning appearances together; after all, my theory is that insufficient warmups cause pitchers to underperform against the first batter, regardless of the base/out state. Read the rest of this entry »

Any day week month now, Zack Wheeler is going to sign a contract that compensates him like a very good pitcher, and he’ll deserve it. He’s been consistently above average the past two years, the kind of guy you’d love to have as a No. 2 starter and one who can fake it as a No. 1. In short, he’s been what the Mets hoped for when he was a highly regarded prospect, after a brief detour into arm-injury-land.

But I think there’s still more there. Zack Wheeler, as currently constituted, does everything a bit better than average. He strikes out a few more batters than average, walks a few less, and suppresses hard contact just a smidge. That makes for an above-average pitcher, of course. But it doesn’t make for a world-devouring ace, the kind who opposing batters fear and hometown fans assume will never lose.

In 2019, Wheeler struck out 23.6% of the batters he faced, which placed him 45th among pitchers who threw at least 100 innings last year. That’s high enough to be effective, especially considering his excellent walk rate — Zack Greinke, Hyun-Jin Ryu, and José Berríos all posted lower K% and were All-Stars — but it’s a rate with plenty of room for improvement.

It’s also a surprising number in light of Wheeler’s arsenal. His fastball sits around 97 mph, and he’s topped out above 100 mph in each of the past two years. He throws it with more horizontal break than your average four-seamer (it has three more inches of horizontal break and one less of vertical break than Jacob deGrom’s four-seamer), but gets excellent movement nonetheless. Read the rest of this entry »

When Will Harris entered Game 7 of the World Series, the Astros were in the driver’s seat. There was only one out in the seventh, and Houston was up by a lone run, but teams in that position usually win — per our Win Expectancy chart, that situation ends in victory 68.7% of the time.

68.7% is notably not 100%, however. When Harris threw Howie Kendrick an 0-1 cutter, Kendrick demonstrated why:

The game wasn’t over after that home run, but it proved decisive nonetheless. The Nationals never relinquished the lead, tacking on insurance runs in the eighth and ninth, and sharked their way to a World Series title. Harris gave up a single to Asdrúbal Cabrera before Roberto Osuna replaced him; after the game, he became a free agent, and may never pitch for the Astros again. Read the rest of this entry »

Gerardo Parra reached base only one time in the World Series, a walk against Josh James in Game 4. It wasn’t a key moment in the series — the Nationals were down 4-0, and while Parra scored, the Nats lost 8-1. When he reached first base, he was downright businesslike:

But businesslike isn’t normally a good description of Parra’s time on the Nationals. He’s widely regarded as a great clubhouse guy, ambushing Stephen Strasburg with hugs and keeping things light over the long grind of a season. He also, you may have heard, uses “Baby Shark” as his walkup music, a song that Nationals fans and players alike have rallied around.

If you’re curious, here’s a handy guide of the hand signals the Nationals make after hits:

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Just as we all predicted in the run-up to the World Series, relief pitching had a hand in determining the outcome. Though starting pitchers contributed admirably to relief efforts (two-thirds of a scoreless inning for the Astros, six scoreless for the Nationals), real relievers had to take the stage occasionally. And after you strip out those innings by starters, a trend emerges.

The Nationals bullpen was bad. That’s no shock — they were bad all year, and they were facing one of the best hitting teams of all time. Strip out Patrick Corbin’s four innings of lights-out relief, and Joe Ross’ two scoreless innings earlier in the series, and the balance of the bullpen recorded a 5.51 ERA, with as many walks as strikeouts. They allowed four home runs in only 16 and a third innings. Fernando Rodney’s line looks like a work of comedy — two innings, no strikeouts, six walks. It was more or less what every Nationals fan feared going into the series.

But if the Nationals bullpen was bad, the Astros bullpen was a full-fledged disaster. When the Astros needed relief innings, one of the best bullpens of the regular season simply wasn’t up to the task. Over 21 and a third innings, they recorded a 5.91 ERA and a 5.37 FIP. They kept their heads above water on the non-contact front, with 24 strikeouts and only 13 walks, but also gave up four home runs. Eight Houston relievers appeared in the series, and seven of them allowed runs.

But even that grim statistical record undersells things. Houston’s bullpen also allowed three unearned runs, while Washington’s pen allowed none. That leaves the Astros with a 7.17 RA/9 out of the bullpen, a number that almost doesn’t look like a baseball statistic. The Astros bullpen put together a 3.75 ERA in the regular season, and a 4.24 FIP. As recently as the ALCS, they’d looked like a cohesive unit, with a 4.12 ERA and 4.80 FIP — not great, but enough to get by against the fearsome Yankee offense. In the World Series, it all crumbled. Read the rest of this entry »

When the Nationals took an early lead in the World Series, there was a popular cry for the team to knock the Astros out while they could. Expend resources you were planning on saving for later in the series, turn Patrick Corbin into a reliever, maybe bring back some starters on short rest: what does it matter if you hurt your chances of winning Game 7, the thinking goes, if Game 7 never happens?

A softer version of this came up as the Cardinals walloped the Braves in Game 5 of the NLDS. The game was already decided. Why not pull Jack Flaherty so that he could pitch Games 1 and 5 of the NLCS rather than Games 3 and 7? It’s not an identical situation, but it relies on the same logic: earlier games happen more often, so get your pitchers into those.

Tomorrow night, there will be yet another version of this discussion. The Astros are a win away from ending the series. If the game goes into extra innings, say, or Justin Verlander gets knocked around but the offense keeps the team in it, would Houston use Zack Greinke in an attempt to end things right then and there? And should they?

While these questions are similar, they’re not identical. Does this reallocation of win probability matter? The answer, as it often is, is “it depends.” I believe the answers to these three questions are “not much,” “not at all,” and “more than you’d think,” respectively, and I’ll attempt to lay out why I think that is the case here.
Read the rest of this entry »

In Game 1 of the World Series, the Nationals found themselves with an interesting decision. They were up three runs on the Astros, but Max Scherzer had labored mightily to hold Houston to two runs. After five innings, he’d thrown 112 pitches. He wouldn’t be heading back out for the sixth.

The Nationals don’t really trust their bullpen. Sure, they could get innings from Sean Doolittle and Daniel Hudson, but they had four innings to cover. Tanner Rainey? Break glass in case of emergency only, and that still leaves an inning. Here is a list of all the relievers the Nationals had used this postseason (as of Game 1) who aren’t Rainey, Doolittle, or Hudson:

Yeesh. Strickland wasn’t on the World Series roster, Suero only made the NLCS roster as a replacement during Daniel Hudson’s paternity leave, and Fernando Rodney — well, we all know the Fernando Rodney Experience. Rainey is no great shakes, either — he was fine this season but uninspiring. Javy Guerra would later pitch an inning in Game 2, but the cupboard was pretty bare.

But Dave Martinez had an answer. Patrick Corbin stepped to the mound to start the sixth. He did his job admirably, striking out two Astros on his way to a scoreless inning, the only blemish a single to Yordan Alvarez. And then he was gone, replaced by Rainey.

Rainey wasn’t good (his four batters: homer, strikeout, walk, walk), but Hudson and Doolittle held on, recording four outs each as the Nationals won 5-4. Martinez squeezed just enough out of the bullpen to make it through the game. Corbin’s inning loomed large: the final margin was one run, and while it’s not automatic that a lesser pitcher would have given up a run in his place, his inning was important. Read the rest of this entry »

I thought that with the advent of the World Series, the intentional walk beat was probably done for. The Astros famously didn’t intentionally walk anyone all year, and Dave Martinez seems to use intentional walks sparingly, albeit at wild times — his intentional walk of Max Muncy was one of the worst of the playoffs.

Imagine my surprise, then, when both managers intentionally walked players last night. The Nationals are always a threat to do that, sure, but the Astros?? If the Astros are intentionally walking someone, you know it’s serious. Let’s dive in.

First, the Nats walk. This one was a classic spot — Yordan Alvarez was at the plate in the sixth with a man on second in a tie game. With Carlos Correa on deck, it’s not as though it got a lot easier, but intentionally walking someone with first base open to switch the platoon matchup is a tactic as old as time.

Being as old as time doesn’t mean a tactic is good, though. Intentionally walking someone with only one out is almost never a good decision — there are just so many ways the inning can go wrong. Indeed, the walk bumped Houston’s win percentage from 60.5% to 62.8%. That 2.3% of a win is a lot to give up with a walk — could it possibly be worth it?

Alvarez has only a tiny platoon split, but with so few plate appearances, he looks like a basically average hitter when it comes to the platoon advantage after regressing his stats. He’s a good hitter overall, though, regardless of handedness. How good of a hitter? Well, Depth Charts doesn’t quite buy the hype; it projects him as a .363 wOBA hitter overall, which works out to .372 against righties. Pretty solid, if not quite Alvarez’s .437 wOBA against righties this year.

How about Correa? He’s a good hitter in his own right; a .355 wOBA per our projections. After applying platoon splits, that works out to .350 against righties. This decision doesn’t look merited unless Strasburg has huge platoon splits — and he emphatically does not. Strasburg has a huge sample of split-less pitching — so much of one, in fact, that even after regressing his line, he’s hardly worse against lefties than righties. Overall, he projects to allow a .278 wOBA to righties and .282 to lefties — basically a scratch. Read the rest of this entry »

It will come as no surprise to you that the Nationals are underdogs in the World Series. Projection systems might vary in their exact view of the series (ZiPS has the Astros as around 60% favorites, while our top-down model has them closer to 70% and betting odds tab them somewhere in between), but every system agrees that Houston is out in front.

It’s simple logic, when you’re an underdog, that increased variance is good for you. You probably can’t beat Magnus Carlsen at chess; he’s the best player in the world, and you’re someone reading this baseball blog. You have a far better chance of beating whoever the best poker player in the world is in a single hand — there’s far more variance involved.

So to maximize their chances of winning the World Series, the Nationals should be looking for ways to increase variance. Some of that will be straightforward — they should be more willing to play the infield in to prevent runs, more willing to issue intentional walks that risk a big inning but come with a higher chance of escaping unscathed, and more willing to play for the win in the ninth inning, even if it means increasing the chances of losing on the spot.

For the most part, baseball doesn’t offer many ways to increase variance. You can’t tell your pitcher to go out there and throw in a way that will either allow six or zero runs, and you can’t tell your batters to either score in bunches or not at all. While I was brainstorming variance-increasing ideas, though, a friend suggested something interesting. What if the Nationals could tinker with their projected starters to create more lopsided matchups? Read the rest of this entry »

On May 23, the Washington Nationals lost a matinee to the Mets in heartbreaking fashion, taking a lead 4-3 with a three-run eighth inning only to give up three runs of their own in the bottom of the frame. The loss dropped the Nationals to 19-31, a whopping 10 games back of the division-leading Phillies. They had been outscored by 40 runs on the season, and Dave Martinez’s seat was getting hot in only his second year as manager.

On Tuesday night, the Nationals will play in the World Series. It’s a change in fortune so extreme that it begs for explanation, and at first glance the explanation is easy. The Nationals have star power but lack depth, the exact kind of team “built for October.” Their starting lineup and top four starting pitchers are phenomenal; the less said about the backups and bullpen, the better. The kind of Nationals team losing 6-4 on a Tuesday afternoon in Queens is simply not the same team playing now.

That’s a convenient explanation, but it’s also wrong. Stephen Strasburg threw seven innings that day, and no regular had the day off. Wander Suero was the only reliever to pitch, and he wasn’t one of the relievers who weighed the Nationals down this year; he had a 4.54 ERA and 3.07 FIP over 71.1 innings, a solid season for a middle reliever.

No, the Nationals sent out their best, their co-ace starter backed by the A-squad, and they lost to a Mets team playing Adeiny Hechavarría, Carlos Gómez, and Juan Lagares all at once. That same team survived the Brewers, outlasted the Dodgers, and walked all over the Cardinals on their way to the first World Series appearance in franchise history. The convenient story isn’t always the right one. Washington simply started playing better.

After that bleak day in May, the Nations went 74-38 to finish the regular season. They outscored their opponents by 189 runs, scoring the most runs in the National League and allowing the third-least. The talent at the top of the roster shone through; the combined brilliance of Strasburg, Max Scherzer, Anthony Rendon, Juan Soto, and all the rest was so great that no amount of bullpen incompetence or lack of bench depth (36-year-old Howie Kendrick played the second-most innings at third base for them this year) could hold the team down.

Shockingly, that 74-38 record wasn’t the best in baseball. The Houston Astros, their World Series opponents, went 74-37 over the same stretch, a scant half-game ahead. They scored four fewer runs than the Nationals and allowed one more. The two hottest teams in baseball are facing off in the World Series, and if you don’t think about it too literally, you could even say they’re constructed from the same blueprint. Read the rest of this entry »