Seth Antonio Martinez (born August 29, 1994) is an American professional baseball pitcher for the Houston Astros of Major League Baseball (MLB). He is 6 feet 2 inches tall. Martinez played college baseball for the Arizona State Sun Devils. He made his MLB debut in 2021.
Martinez was born and grew up in Sierra Vista, Arizona, and attended Sunrise Mountain High School, where he played baseball and golf. Over four varsity seasons, he posted a record of 19-4 with a 2.86 ERA and 172 strikeouts over 144 innings.
Martinez was selected in the 17th round of the 2016 MLB draft by the Oakland Athletics. After signing with the team he was assigned to the Arizona League Athletics, where he pitched in three games.
Martinez began the 2017 season with the Class A Short Season Vermont Lake Monsters before he was promoted to the Class A Beloit Snappers after one start. Martinez went 5-10 with a 3.49 ERA over 95.1 innings pitched with Beloit and returned to the team for the 2018 season. He began the 2019 season with the Stockton Ports of the California League and was promoted to the Double-A Midland RockHounds.
Martinez was selected by the Houston Astros in the minor league phase of the 2020 Rule 5 draft. The Astros assigned Martinez to the AAA Sugar Land Skeeters to start the 2021 season. He was called up for his MLB debut on September 20, 2021.