Blake M. Treinen (, born June 30, 1988) is an American professional baseball pitcher for the Los Angeles Dodgers of Major League Baseball (MLB). He played college baseball for the Baker Wildcats and the South Dakota State Jackrabbits baseball team. The Oakland Athletics selected Treinen in the seventh round of the 2011 MLB draft, and he made his MLB debut in 2014. He has also played in MLB for the Athletics and Washington Nationals . Treinen was an All-Star in 2018 and won the 2020 World Series with the Dodgers over the Tampa Bay Rays. Amateur career Treinen attended Osage City High School in Osage City, Kansas. He played for the school's baseball team as a freshman, but quit during his sophomore year as he developed prediabetes. He returned to the team in his junior year, with his fastball reaching . He enrolled at Baker University, where he played college baseball for the Baker Wildcats in the National Association of Intercollegiate Athletics in 2007. He transferred to the University of Arkansas in 2008, but did not play for its baseball team. He attempted to walk on to the Arkansas Razorbacks baseball team in the National Collegiate Athletic Association (NCAA), but was denied the opportunity to try out. He began weight training. During Christmas break, Treinen participated in a baseball training camp led by Don Czyz, a retired Minor League Baseball pitcher. Czyz recommended Treinen to Ritchie Price, the head coach of the South Dakota State Jackrabbits baseball team. Treinen transferred to South Dakota State University to continue his college baseball career with the Jackrabbits. He had to sit out 2009 due to the NCAA's rules on transfers. By the time he was able to pitch for the Jackrabbits, his fastball averaged . The Miami Marlins selected Treinen in the 23rd round of the 2010 MLB draft. Though Treinen was willing to sign, an MRI revealed shoulder inflammation, and the Marlins withdrew the offer. In 2011, his senior year, Treinen had a 7–3 win–loss record and a 3.00 earned run average (ERA). During the season, his fastball reached . Professional career Oakland Athletics (2011–2012) The Oakland Athletics selected Treinen in the seventh round of the 2011 MLB draft. He signed with Oakland, receiving a $52,000 signing bonus. Pitching for the Stockton Ports of the Class A-Advanced California League in 2012, Treinen had a season he called "subpar" and "mediocre", in which