The 2020 postseason made history when three prospects -- Twins outfielder Alex Kirilloff, Rays left-hander Shane McClanahan and Padres left-hander Ryan Weathers -- all made their MLB debuts during the playoffs.
It was the first time multiple players made their big league debuts in the postseason in the same year. And only two players had ever debuted in the postseason before that: Adalberto Mondesi for the Royals in 2015 and Mark Kiger for the A's in 2006.
Here are all the players who have made their MLB debuts in the postseason, starting with the most recent.
Ryan Weathers, Padres -- Oct. 6, 2020
Weathers, the No. 7 overall Draft pick by the Padres in 2017 and one of the top pitching prospects in the organization, made his big league debut in Game 1 of the 2020 National League Division Series against the rival Dodgers. Brought in to face Los Angeles' big lefty bats, Weathers got Corey Seager to line out, Max Muncy to fly out and struck out Cody Bellinger in 1 1/3 scoreless innings of relief.
Shane McClanahan, Rays -- Oct. 5, 2020
Now the Rays' Game 1 starter for the 2021 American League Division Series at age 24, a year ago McClanahan was a Top 100 prospect taking the mound for the first time against the Yankees in Game 1 of the 2020 ALDS. The hard-throwing lefty made four relief appearances in the playoffs and struggled at times, but his best one came in the World Series against the Dodgers, when he pitched a scoreless ninth inning in the Rays' Game 3 loss.
Alex Kirilloff, Twins -- Sept. 30, 2020
Kirilloff was ranked the No. 27 overall prospect in baseball when the Twins added him to their Wild Card Series roster for the 2020 postseason. The 22-year-old lefty slugger drew the start in right field for Game 2 against the Astros and went 1-for-4 with a single. He lined out with the bases loaded in his first career at-bat but ripped a base hit in the next one and made a terrific sliding catch in right field.
Adalberto Mondesi, Royals -- Oct. 30, 2015
The Royals shortstop became the first player to make his Major League debut in the World Series, pinch-hitting for Kansas City in the fifth inning of Game 3 against the Mets at Citi Field. The 20-year-old speedster struck out against Noah Syndergaard in his only at-bat.
Mark Kiger, A's -- Oct. 13, 2006
Kiger is unique because he only played in the postseason. The second baseman never played a regular-season game in his career. His two appearances in the 2006 American League Championship Series against the Tigers were his only Major League games -- and he never even got a plate appearance, playing only as a late-game defensive replacement. His debut came when he subbed in at second in the eighth inning of Game 3, and he did the same in the ninth inning of Game 4.