Trevor Anthony Williams (born April 25, 1992) is an American professional baseball pitcher for the Washington Nationals of Major League Baseball (MLB). He has previously played in MLB for the Pittsburgh Pirates, Chicago Cubs, and New York Mets. He made his MLB debut in 2016 with the Pirates.
After graduating from Rancho Bernardo High School, Williams played college baseball at Arizona State University for the Sun Devils from 2011 to 2013. He started 38 games during his career, going 18âÂÂ8 with a 2.98 earned run average (ERA). In 2012, he played collegiate summer baseball with the Orleans Firebirds of the Cape Cod Baseball League.
The Miami Marlins selected Williams in the second round of the 2013 Major League Baseball draft. He made his professional debut with the Gulf Coast League Marlins and also played for the Batavia Muckdogs and Greensboro Grasshoppers that year. In 12 starts between the three teams he was 0âÂÂ2 with a 2.38 ERA. Williams started 2014 with the Jupiter Hammerheads, earning Florida State League All-Star honors, and was promoted to the Jacksonville Suns in August. In 26 games started between both clubs he compiled an 8âÂÂ7 record and 3.13 ERA. In 2015, Williams played for both Jacksonville and the New Orleans Zephyrs, pitching to a 7âÂÂ10 record and 3.85 ERA in 25 games (24 starts).
On October 24, 2015, the Marlins traded Williams to the Pittsburgh Pirates for Richard Mitchell as compensation for the Marlins hiring Jim Benedict from the Pirates as their new vice president of pitching development. He spent 2016 with the Indianapolis Indians where he was 9âÂÂ6 with a 2.53 ERA in twenty games (19 starts).
Williams was promoted to the Major Leagues for September call ups in 2016. In innings pitched for the Pirates, he was 1âÂÂ1 with a 7.82 ERA.
Williams began 2017 with Pittsburgh as a member of their bullpen. As the season progressed, he was eventually moved into the starting rotation. In 31 games (25 starts) for the Pirates, he compiled a 7âÂÂ9 record with a 4.07 ERA and 1.31 WHIP. He began 2018 as a member of Pittsburgh's starting rotation. Williams posted a career year, finishing with an ERA of 3.11 in 31 starts, ending the season with a record of 14âÂÂ10 in innings. In 2019, Williams had a down year, posting a record of 7âÂÂ9 with a 5.38 ERA over 26 starts and innings.
In 2020 he was 2-8 with a 6.18 ERA. He led the NL in home runs allowed (15). On November 20, 2020, Williams was designated for assignment. He elected free agency on November 28.
On February 5, 2021, Williams signed a one-year, $2.5 million contract with the Chicago Cubs. On May 31, Williams was placed on the injured list after undergoing an emergency appendectomy. In 13 games (12 starts) with the Cubs, Williams went 4âÂÂ2 with a 5.06 ERA across innings.
On July 30, 2021, Williams was traded to the New York Mets along with Javier Baez and cash considerations in exchange for Pete Crow-Armstrong. He made 10 appearances for the Mets down the stretch, registering a 3.06 ERA with 29 strikeouts in 32.1 innings pitched.
On July 14, 2022, Williams recorded his first career save after tossing three scoreless innings of relief against the Chicago Cubs.
On December 10, 2022, Williams signed a two-year, $13 million contract with the Washington Nationals. He made 30 appearances for the Nationals in 2023, posting a 5.55 ERA with 111 strikeouts across 144<sup>1</sup>âÂÂ<sub>3</sub> innings pitched. In 2024, he made 13 appearances for the team, posting a 2.03 ERA with 59 strikeouts across 66<sup>2</sup>âÂÂ<sub>3</sub> innings pitched. He became a free agent following the season.
On December 30, 2024, Williams signed a two-year, $14 million contract to remain with the Nationals. He made 17 starts for Washington in 2025, struggling to a 3-10 record and 6.21 ERA with 65 strikeouts across innings pitched. On July 9, 2025, it was announced that Williams had suffered a partial tear in his ulnar collateral ligament and would require surgery; he underwent an internal brace procedure on July 19.
Williams is a devout Catholic; he is a member of the Knights of Columbus and his heavily-tattooed arms include the initialized motto of the Society of Jesus, "AMDG," and an allusion to Benedict of Nursia.
In November 2014, he married his wife, Jackie. Their son was born in 2015, and their adopted daughter was born in July 2019.