Playoff baseball is interesting as a concept. After a regular season of 162 games to determine the game’s best teams, the sport’s champion is then determined by a few best-of-five and best-of-seven series. It’s not unlike asking the top 10 finishers of a marathon to run a 5K in order to decide who should receive first place. The sprint-like nature of the postseason is baseball’s Theatre of the Absurd (especially where small sample sizes are concerned): entertaining and a bit preposterous at the same time.
One of the areas where the effect is most pronounced is in the realm of Win Probability Added (WPA) and Leverage Index (LI). Championships are on the line and the lens of the postseason only serves to magnify what would be tense moments even on a quiet night in July. A big WPA day turns a player into a legend, while going the opposite direction turns a player into the goat. But not every intriguing event with a high WPA or LI is a starring turn. With that in mind, let’s look at a few of the stranger WPA- and LI-related things we’ve seen during the League Championship Series.
Caleb Ferguson and Playoff Stress
Caleb Ferguson was a 38th-round pick out of high school for the Dodgers in 2014. A starter through his whole minor-league career — he recorded only three relief appearances in the minors prior to this year — he found a home in the Dodgers’ bullpen this year. While he doesn’t have an incredible arsenal — Eric Longenhagen and Kiley McDaniel graded his fastball as a 50, curveball as a 45, and changeup as a 45 — he put up solid numbers as a reliever, striking out over 30% of batters and produced a 2.55 xFIP. After that solid rookie season, Ferguson joined the playoff roster as one of three lefties — the other two being Alex Wood and Julio Urias — in the Los Angeles bullpen.
Generally speaking, he didn’t pitch in high-leverage situations this season. With an average leverage index of 1.08 (Overall average is 1), he ranked 123rd in baseball for relievers with at least 30 innings pitched. In the League Championship Series, however, things have been a little different.