Joan Manuel Adon (born August 12, 1998) is a Dominican professional baseball pitcher in the Washington Nationals organization. He made his Major League Baseball (MLB) debut in 2021.
Adon split the 2021 minor league season between the High–A Wilmington Blue Rocks, the Double–A Harrisburg Senators, and the Triple–A Rochester Red Wings, going a combined 7–6 with a 4.97 ERA and 122 strikeouts over 105 innings.
On October 3, 2021, Adon was promoted to the active roster to make his MLB debut against the Boston Red Sox. He pitched into the sixth inning, striking out nine, while giving up two earned runs: a fourth-inning solo homer by Rafael Devers, then a runner bequeathed to reliever Patrick Murphy who came around to score in the sixth. His nine strikeouts were the most by a pitcher making his MLB debut in the 2021 season.
Adon made the rotation to begin the 2022 season, despite only having made five starts above the High–A level. Adon was the first pitcher to record his 10th loss during the season, which happened on June 7 after a start against the Miami Marlins in which he yielded 8 runs in 3 innings pitched, his worst start of the season. After the game, he was optioned to Triple-A Rochester, as Stephen Strasburg came off the injured list on June 9 to take his place in the rotation. At the time, Adon was 1–10 with a 6.95 ERA and 1.76 WHIP in 12 starts, walking 5.66 batters per 9 innings, all league-worst totals among pitchers with at least 50 innings pitched. Major League Leaderboards In addition, his whiff rate was the lowest in the major leagues, as batters made contact on 86.6% of their swings. Major League Leaderboards His one win, his first in the major leagues, came in a start against the Arizona Diamondbacks on April 19, in which he threw scoreless innings. Adon was brought back up to the major leagues to start the first game of a double-header against the Philadelphia Phillies on June 17, but after recording his 11th loss, Adon was sent back down to Triple-A the following day.
Adon was optioned to Triple–A Rochester to begin the 2024 season. In 8 games for Washington, he struggled to a 6.75 ERA with 6 strikeouts over innings pitched. On August 28, 2024, Adon was placed on the injured list with a right biceps strain. He was transferred to the 60–day injured list on September 20, ending his season. Adon was designated for assignment on January 8, 2025. He cleared waivers and was sent outright to Rochester on January 15.
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