Considering Justin Verlander on Short Rest
Justin Verlander has never started a game on short rest in the way we conventionally think about short rest starts. Back in 2011, Verlander started Game 1 of the ALDS against the Yankees, but the game was suspended after one inning; he then started Game 3 of that series on two days’ rest. In 2017, Verlander started Game 1 of the ALDS against Boston, pitching six innings and throwing 99 pitches. He followed that start up with 2.2 innings of relief pitching after three days’ rest. Neither appearance really fits what we might expect to see from Verlander today when he starts on three days’ rest after pitching seven shutout innings on Friday.
Even if we add a history of Verlander making starts on short rest, given the very small number of starts and the huge time gap between them, it wouldn’t be especially relevant. Similarly, that Dallas Keuchel just fared poorly on short rest against the Cardinals probably also doesn’t have much bearing on what Verlander manages. The same is true for other pitchers over the last dozen years. There just isn’t a great body of evidence to tell us what we might see over the course of one game. What we do know is that Verlander is pitching a day earlier than he normally would, and that probably has some effect on his body and arm.
For the sake of argument, let’s say that pitching on short rest makes Verlander slightly weaker as a pitcher. We don’t know this to be the case, but it is certainly possible. And we can make another assumption that Verlander being slightly weaker means that his fastball won’t be as hard as it would be typically. Verlander’s fastball averaged 94.6 mph this season and in his start on Friday, it averaged 94.5 mph. If we wanted to know how Verlander might pitch on short rest, we could look at starts where his average fastball velocity was something less than his season-long average. Read the rest of this entry »

Jay Jaffe