Jonathan Trey Brubaker
- Bats Right, Throws Right
- Height 6' 3", Weight 195 lb.
- School University of Akron
- High School Tecumseh High School (New Carlisle)
- Debut July 26, 2020
He was 5-1 with a 2.03 ERA as a high school junior then improved to 4-1, 0.76 as a senior, hitting over .300 both years as well.  He struggled as a college freshman (0-7, 7.25) and improved to 3-5, 4.02 as a sophomore.  His junior year, he was 5-4 with a 3.63 ERA.  The Pittsburgh Pirates took him in the 6th round of the 2015 amateur draft, one pick after Steven Duggar; the scout was Trevor Haley. 
Brubaker had a fine pro debut with the West Virginia Black Bears at 6-4, 2.82 with only 12 walks in 73 1/3 IP, helping to a .94 WHIP, a better record than he had shown as a collegian. He tied for 4th in the New York-Penn League in wins and was 5th in ERA (between Luis Cedeno and Jordan Holloway.  He slumped in 2016 with the West Virginia Power (4-5, 3.48) and Bradenton Marauders (2-6, 5.32). Only Dario Agrazal had more losses among Buc farmhands but he tied Brandon Waddell for 4th in strikeouts (120).
The Ohio native was 7-6 with a 4.44 ERA for the 2017 Altoona Curve then won game 2 of the Eastern League finals (2 R in 6 IP) as Altoona swept the Trenton Thunder.  He fanned 109 in the regular season, tying Steven Brault, Taylor Hearn and Eduardo Vera for 6th in the Pirates chain. He was 0-1 with a 2.63 ERA for the Glendale Desert Dogs of the Arizona Fall League.
He had a strong 2018 for Altoona (2-2, 1.80, 35 K, 8 BB in 35 IP) and the Indianapolis Indians (8-4, 3.10). He led Pirates minor leaguers in ERA (2.81)  and was 7th in wins and second in strikeouts (131, 4 behind Mitch Keller). He was named the team's Minor League Pitcher of the Year.  He looked close to the majors as he started 2019 sharp back in AAA (2-1, 2.59) but a right forearm strain ended his season early. 
Brubaker made the Pirates' roster at the start of the 2020 season, thanks in part to the expanded rosters due to the COVID-19 pandemic. He debuted in the team's first win of the year, on July 26th, relieving Keller in the 6th with a 4-1 lead against the St. Louis Cardinals. He struck out Kolten Wong and Tommy Edman. Paul Goldschmidt singled but Bryan Reynolds gunned him down trying to make it a double. In the 7th, he gave up a double to Paul DeJong, whiffed Matt Carpenter, gave up a Yadier Molina single, struck out Dexter Fowler and got Tyler O'Neill on a fly. Michael Feliz took over in the 8th. After another fine relief outing (1 H, 0 R in 3 IP), he moved into the rotation for a spot when Keller was injured. In his first start on August 6th, he gave up a three-run dinger to the Minnesota Twins' Miguel Sano in the 1st, then pitched two shutout innings before fellow rookie Cody Ponce relieved him.