Mason Thompson

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Mason Thompson
File:Nationals vs. Mets Opening Night - 52031821052 (cropped).jpg
Thompson with the Washington Nationals in 2022
Free agent
Pitcher
Born: (1998-02-20) February 20, 1998 (age 28)
Round Rock, Texas, U.S.
Bats: Right
Throws: Right
MLB debut
June 22, 2021, for the San Diego Padres
MLB statistics
(through 2025 season)
Win–loss record7–9
Earned run average5.21
Strikeouts93
Stats at Baseball ReferenceLua error in Module:EditAtWikidata at line 29: attempt to index field 'wikibase' (a nil value).
Managerial record at Baseball ReferenceLua error in Module:EditAtWikidata at line 29: attempt to index field 'wikibase' (a nil value).
Teams

Mason Lane Thompson (born February 20, 1998) is an American professional baseball pitcher who is a free agent. He has previously played in Major League Baseball (MLB) for the San Diego Padres and Washington Nationals.

Amateur career

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Thompson attended Round Rock High School in Round Rock, Texas. He underwent Tommy John surgery as a junior, and pitched only one inning as a senior.[1] He was selected by the San Diego Padres in the third round, 85th overall, of the 2016 Major League Baseball draft.[2] He signed for $1.75 million, forgoing his commitment to play college baseball for the Texas Longhorns.[3]

Professional career

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San Diego Padres

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Thompson made his professional debut with the Arizona League Padres, tossing 12 innings of 2.25 ERA ball. In 2017, Thompson played for the Single-A Fort Wayne TinCaps, posting a 2-4 record and 4.67 ERA in seven appearances. He returned to Fort Wayne for the 2018 season, pitching to a 6-8 record and 4.94 ERA with 97 strikeouts in 93 innings of work. In 2019, Thompson played for the High-A Lake Elsinore Storm, only appearing in seven games due to injury, and recorded an 0-5 record and 7.66 ERA.[4] Thompson did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[5] The Padres added him to their 40-man roster after the 2020 season.[6]

On June 20, 2021, Thompson was promoted to the major leagues for the first time.[7] He made his MLB debut on June 22, pitching one-third of an inning against the Los Angeles Dodgers, and earning a hold.[8]

Washington Nationals

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On July 30, 2021, Thompson and Jordy Barley were traded to the Washington Nationals in exchange for Daniel Hudson.[9] He was activated the next day and made his Nationals debut on August 2.[10] In 27 relief appearances, he posted a 4.15 ERA with 21 strikeouts across 21+23 innings of work.

On April 10, 2022, Thompson was placed on the injured list due to a biceps injury.[11] He was transferred to the 60-day IL on May 10 with biceps tendinitis.[12] He was activated on July 1.[13] On September 5, he earned his first major league save by pitching the final three scoreless innings against the St. Louis Cardinals in a 6-0 Nationals win in St. Louis. In 24 games, Thompson recorded a 2.92 ERA with 15 strikeouts and one save. In 2023, Thompson made 51 relief appearances for Washington, registering a 5.50 ERA with 44 strikeouts across 54 innings of work.[14]

On February 28, 2024, it was announced that Thompson would require Tommy John surgery, ending his season prematurely.[15] He was activated from the injured list to make his return from surgery on July 5, 2025.[16] In 14 appearances for the Nationals, Thompson struggled to an 11.81 ERA and 1-1 record with 11 strikeouts across 10+23 innings pitched. On September 23, Thompson was placed on the injured list due to right biceps tendinitis, ending his season.[17] On October 29, Thompson was removed from the 40-man roster and sent outright to Rochester; he subsequently rejected the assignment and elected free agency.[18]

References

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