Tyson Michael Blach (/ˈblɑːk/ BLAHK;[1] born October 20, 1990) is an American professional baseball pitcher who is a free agent.

He has previously played in Major League Baseball (MLB) for the San Francisco Giants, Baltimore Orioles, and Colorado Rockies.

Blach played baseball and tennis for Regis Jesuit High School in Aurora, Colorado.

[2] The San Francisco Giants selected Blach in the fifth round (178th overall) of the 2012 Major League Baseball draft.

In 22 games (20 starts), he went 12–4 with a 2.90 earned run average (ERA), 117 strikeouts and 18 base on balls in 130+1⁄3 innings.

[9] On October 1, 2016, in his second MLB start, Blach pitched eight shutout innings against Clayton Kershaw and the Los Angeles Dodgers, allowing three hits and securing his first win.

[10] Blach was the winning pitcher in Game 3 of the 2016 NLDS against the Chicago Cubs after pitching two scoreless innings in relief.

[16] He made 2 appearances for the Tides before the end of the year, but struggled tremendously, allowing 10 runs in 5.1 innings of work.

[17] On July 15, 2020, Blach underwent Tommy John surgery, causing him to miss the truncated 2020 Major League season.

[30] On December 21, 2023, Blach again re-signed with the Rockies on a minor-league deal, which included an invitation to spring training.

[32] In 18 games (10 starts) for Colorado, Blach compiled a 3–6 record and 6.36 ERA with 34 strikeouts across 63+2⁄3 innings pitched.

[35] On September 8, the Rockies designated Blach for assignment to clear roster space for Victor Vodnik's return from the injured list.