Joseph Anthony Mancini
- Bats Right, Throws Right
- Height 6' 4", Weight 215 lb.
- School University of Notre Dame
- High School Winter Haven High School
- Debut September 20, 2016
Trey Mancini homered in his major league debut for the Baltimore Orioles against the Boston Red Sox on September 20, 2016. He connected for a solo shot off Eduardo Rodriguez in the 5th inning, but the Orioles lost the game, 5-2. He then homered in his next two games as well to become the first player in Orioles history to accomplish the feat. He hit .357 with the 3 homers and 5 RBIs in 5 games in his first taste of the majors, and was on the team's roster for the Wild Card Game, although he did not play.
He made the team out of spring training in 2017 although it was not clear at first how much playing time he would see. He quickly gave indications that he should be in the line-up often, however, as he had a pair of two-homer games over the span of three games in early April, turning the trick against the Boston Red Sox on April 12th, and again against the Toronto Blue Jays on April 16th. In that second game, he victimized Ryan Tepera with a three-run shot in the 6th and added a solo blast off Matt Dermody in the 8th. That gave him 7 homers in his first 12 major league games, matching the record pace set by Dino Restelli in 1949 and Trevor Story the year before.
- 2017 Topps All-Star Rookie Team
- 20-Home Run Seasons: 3 (2017-2019)
- 30-Home Run Seasons: 1 (2019)
- 100 Runs Scored Seasons: 1 (2019)