Seth Antonio Martinez is an American professional baseball pitcher in the Boston Red Sox organization. He has previously played in Major League Baseball (MLB) for the Houston Astros and Miami Marlins. Martinez played college baseball for the Arizona State Sun Devils. The Oakland Athletics selected him in the 17th round of the 2016 MLB draft. Martinez remained in the Athletics organization until the Astros selected him in the 2020 Rule 5 draft, and he made his MLB debut in 2021.