The Joy of Ji-Man Choi
Over five postseason games, the Rays have had a plethora of heroes. Tommy Pham is batting .429/.455/.714, good for a scalding 213 wRC+. Willy Adames has been even better, with a 240 wRC+ and an actual cannon for an arm. Charlie Morton has thrown 10 innings and allowed only a single run. Nick Anderson and Diego Castillo have been lights out; the list goes on and on. Spare a thought, though, for Ji-Man Choi, who might not lead the team in batting but surely leads it in sheer delight.
If you want to understand how weird Choi’s contributions have been, a good place to start is the walk rate. He’s drawn six walks in 19 postseason plate appearances, good for a 31.6% walk rate. That’s second only to Giancarlo Stanton’s 36.4% among batters with 10 or more PA, and it’s the reason for his outrageous .154/.421/.385 batting line. When you see a slugging percentage lower than an on-base percentage, that usually means a batter has no power. Not so with Choi — he has a home run in the postseason and a solid .231 ISO. He just walks all the dang time.
But uh — a .154 batting average? Does he have a .000 BABIP or something? Not at all — it’s a reasonable .250. No, his batting average woes come down to a 42.1% strikeout rate, which is about as terrible as it sounds, even in the small sample theatre that is October baseball. It’s a strikeout world these days, but not that much of a strikeout world; the only players in the playoffs with a higher strikeout rate than Choi are A.J. Pollock (76.9%!), Miguel Sanó, Gavin Lux, and Brandon Lowe, and two of those guys have wRC+’s below zero.
In fact, Choi’s .250 BABIP is of the 1-for-4 variety, because 15 of his 19 plate appearances have ended in a strikeout, walk, or home run. That home run came in the Rays’ 10-3 pasting of Zack Greinke in Game 3, and it buoys Choi’s overall stats, so I might as well show it here:

