Blake Treinen

Blake Treinen
Treinen with the Los Angeles Dodgers in 2025
Los Angeles Dodgers – No. 49
Relief pitcher
Born: (1988-06-30) June 30, 1988
Wichita, Kansas, U.S.
Bats: Right
Throws: Right
MLB debut
April 12, 2014, for the Washington Nationals
MLB statistics
(through 2025 season)
Win–loss record45–41
Earned run average2.90
Strikeouts596
Saves82
Stats at Baseball Reference 
Teams
Career highlights and awards

Blake Michael Treinen (/ˈtrnɛn/ TRY-nen, born June 30, 1988) is an American professional baseball relief pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). He has previously played in MLB for the Washington Nationals and Oakland Athletics.

Treinen played college baseball for the Baker Wildcats and South Dakota State Jackrabbits. The Athletics selected him in the seventh round of the 2011 MLB draft. He was traded to the Nationals in 2013 and made his major league debut in 2014. After losing his closer role, the Nationals traded him back to Oakland in 2017, and Treinen was an All-Star in 2018. After again losing the closer role in 2019, he joined the Dodgers and pitched on the 2020, 2024 and 2025 World Series championship teams.