Justin Warren Dunn
- Bats Right, Throws Right
- Height 6' 2", Weight 185 lb.
- School Boston College
- High School The Gunnery
- Debut September 12, 2019
Pitcher Justin Dunn was selected by the New York Mets with the 19th overall pick in the 2016 amateur draft out of Boston College. Three years earlier, in 2013, he had been drafted by the Los Angeles Dodgers coming out of high school, but had not signed.
In his first professional season in 2016, he went 1-1, 1.50 in 11 games with the Brooklyn Cyclones of the New York-Penn League, logging 30 innings. He then spent 2017 with the St. Lucie Mets in the Florida State League, making 16 starts in 20 appearances, with a record of 5-6, 5.00. His peripheral numbers weren't that great either, with 101 hits and 48 walks allowed in 95 1/3 innings, against 75 strikeouts. He bounced back in 2018, however, as he was 2-3, 2.36 after his first 9 starts with St. Lucie to earn a promotion to the AA Binghamton Rumble Ponies. There, he went 6-5, 4.22 to finish the year at 8-8, 3.59 in 24 games and 135 1/3 innings. He also struck out 156 batters while walking 52.
On December 1, 2018, he was one of three prospects sent by the Mets to the Seattle Mariners to acquire 2B Robinson Cano and P Edwin Diaz; joining him were Gerson Bautista and Jarred Kelenic, another first-rounder, and two players with expensive contracts the M's were forced to take on in OF Jay Bruce and P Anthony Swarzak. He was named to the American League team for the 2019 Futures Game, alongside Kelenic. He went 9-5, 3.55 for the AA Arkansas Travelers that season, making 25 starts and pitching 131 2/3 innings. He was called up to Seattle when rosters expanded in September and made his debut on September 12th, giving up 2 runs in two-thirds of an inning in an abbreviated start against the Cincinnati Reds. He was slated to only be the opener, but had a rough go of it, as he walked the bases loaded while allowing three stolen bases, allowed a sacrifice fly, walked the bases loaded again, allowed another sac fly, issued another walk, and was removed in favor of Zac Grotz. Things went better in his other 3 starts and he ended his first taste of the majors with a 2.70 ERA in 6 2/3 innings.
In 2020, he was a regular starter with the Mariners during the Coronavirus-shortened season. He made 10 starts, going 4-1, 4.34. He totalled just 45 2/3 innings, allowing 31 hits and as many walks, while striking out38 batters. In 2021, he made 11 starts, going 1-3, 3.75. He did not really pitch deeper into games, as his innings total was 50 1/3. He allowed 37 hits, and and reduced his walks a bit, to 29, while increasing his strikeouts to 49. He was still not an established starter for all that, and on March 14, 2022, it was as a prospect that he was included in the second major trade of his career, heading to the Cincinnati Reds with Jake Fraley, Brandon Williamson and a player to be named later (P Connor Phillips) in return for 3B Eugenio Suarez and OF Jesse Winker.