Peralta signed with the Seattle Mariners as an international free agent in April 2013. He made his professional debut that year with the Dominican Summer League Mariners and spent the whole season there,going 3-3 with a 1.46 ERA in 13 games (ten starts). In 2014,he pitched for the Arizona League Mariners,where he pitched to a 1-6 record and 5.29 ERA in 12 starts,and in 2015,he returned there,going 2-3 with a 4.11 ERA in 11 games (nine starts).
Peralta pitched 2017 with the Carolina Mudcats and Biloxi.[4][5] In 25 games (19 starts) between the two clubs,he was 3–8 with a 2.63 ERA and 1.16 WHIP.[6] The Brewers added him to their 40-man roster after the season.[7]MLB.com ranked Peralta as Milwaukee's tenth-ranked prospect going into the 2018 season.[8]
Peralta began 2018 with the Colorado Springs Sky Sox and was called up to Milwaukee on May 13 to make his MLB debut. He debuted that same night against the Colorado Rockies at Coors Field. He recorded 13 strikeouts in 5+2⁄3 shutout innings, setting the Brewers franchise record for strikeouts by a first-time starter. For the season, he was 6–4 with a 4.25 ERA. Of all MLB pitchers, he held right-handed batters to the lowest batting average, .110 (in 30 or more innings).[9] In 2019, Peralta made 39 appearances for the Brewers, registering a 7–3 record and 5.29 ERA with 115 strikeouts in 85 innings of work.
On February 28, 2020, Peralta and the Brewers agreed to a five-year, $15.5MM contract extension.[10] In 2020, Peralta made 15 appearances for the Brewers, pitching to a 3–1 record and a 3.99 ERA with 47 strikeouts in 29+1⁄3 innings pitched.
In 2021, Peralta posted a 10–5 record and a 2.81 ERA with 195 strikeouts in 144+1⁄3 innings over 28 appearances. He was selected to participate in that year's All-Star Game,[11] during which he struck out three consecutive batters in the seventh inning.[12]
On June 14, 2022, Peralta was placed on the 60-day injured list with a latissimus dorsi injury.[13] He was activated on August 3.[14] In 2022, Peralta went 4–4 with a 3.58 ERA and 86 strikeouts in 78 innings of work.
In 2023, Peralta posted a 12–10 record and a 3.86 ERA with 210 strikeouts in 165+2⁄3 innings.
In 2024, Peralta posted an 11–9 record and a 3.68 ERA with 200 strikeouts in 173+2⁄3 innings.
On May 12, 2025, Peralta recorded his 1,000th career strikeout when he struck out Daniel Schneemann in the bottom of the fifth inning against the Cleveland Guardians. He is the fourth Brewers pitcher to achieve that milestone.[15]
He was named NL Pitcher of the Month in August 2025, during which he recorded four wins in five starts (lasting five innings in two starts and six in the other three) with a 0.32 ERA, finishing the month with a 24-inning scoreless streak. He became the first-ever Brewer with four consecutive starts of at least five innings without surrendering a run.[16]
Personal life
Peralta and his wife, Maritza, have one daughter together.[17]
Peralta's brother, Luis, is also a professional baseball pitcher, currently with the Colorado Rockies.[18]
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