Jesse Allen Hahn
- Bats Right, Throws Right
- Height 6' 5", Weight 190 lb.
- School Virginia Polytechnic Institute
- High School Fitch Senior High School
- Debut June 3, 2014
Jesse Hahn recorded his first career win on June 14, 2014 for the San Diego Padres against the New York Mets, 5-0. He gave up a single hit in 6 innings while striking out 7 and also had an RBI single for his first career hit. His father Fred Hahn commented to a reporter after the game: "I'm surprised he didn't run to third base. He's not much of a hitter." His first career start, on June 3rd, had not gone as well, as he had given up 4 runs on 6 hits in 3 2/3 innings to be charged with a 4-1 loss, and he had been sent back to the minor leagues between the two games. Once he got the first win out of the way, however, he became one of the better pitchers in the major leagues, winning 7 of his first 9 starts with an ERA of 2.01 by the end of July. He finished the season at 7-4, 3.07. On December 18th, he was traded to the Oakland Athletics, along with R.J. Alvarez, in return for C Derek Norris and P Seth Streich.
On March 25, 2015, he pitched a four-hitter against the Detroit Tigers to record the first complete game and shutout of his major league career, 4-0. He had not pitched particularly well up to that point, as his record stood at 1-4, 4.43 after 8 starts. he made 16 starts for Oakland that year, going 6-6, 3.35 in what was a promising first season with the team. However, he missed part of the season because of injuries, then things went sour over the next two years. In 2016, he fell to 2-4, 6.02 in 9 starts and in 2017 he was 3-6, 5.30 in 14 games (13 starts). He failed to reach 100 innings in any of the three seasons. He pitched briefly in the minors both years, but with mixed results: he was 1-7, 4.32 for the Nashville Sounds in 2016, and 2-0, 4.15 in 7 games between Nashville and the Class A Stockton Ports in 2017.
Needing to re-launch his career in another organization, on January 29, 2018, he was traded to the Kansas City Royals along with minor leaguer Heath Fillmyer in return for two veterans, P Ryan Buchter and DH Brandon Moss. However, things did not get off to a good start as he went down with an elbow injury in spring training and was immediately placed on the 60-day DL.