Trevor Anthony Williams
- Bats Right, Throws Right
- Height 6' 3", Weight 230 lb.
- School Arizona State University
- High School Rancho Bernardo High School
- Debut September 7, 2016
Trevor Williams was a winner his his major league debut for the Pittsburgh Pirates on September 7, 2016. Coming in relief of Jameson Taillon, he pitched three innings against the St. Louis Cardinals, giving up one unearned runs on 3 hits and a walk while striking out 3, and received credit for his team's 4-3 win.
Williams wore number 57 in 2016 and during his first full season in 2017, when he was 7-9, 4.07 in 31 games. In 2018, however, he switched to number 34 in honor of Cory Hahn, his former roommate at Arizona State University who was left paralyzed after an on-field accident in his freshman season in 2011. he had a decent first half in 2018, going 7-7, 4,.36 in 19 starts, and then suddenly became of the toughest pitchers in the majors during the second half. In his first 10 starts after the All-Star break, he went 6-2, 1.19. On July 23rd, he pitched the first complete game and shutout of his career when he defeated the Cleveland Indians, 7-0. On September 16th, he pitched 6 scoreless innings against the Milwaukee Brewers, as the Bucs won, 3-2, over a Brewers team working furiously to ensure a postseason bid.
- Adam Berry: "Williams to wear No. 34 to honor friend: Bucs righty pays homage to ASU teammate, who was paralyzed on field", mlb.com, November 21, 2017. 
- Adrian Garro and Adam Berry: "Trevor Williams and his family reacting to his first MLB win will make you feel feelings", "Cut4", mlb.com, September 8, 2016.