Robert Gsellman earned the win on Saturday after allowing two runs on seven hits in 5.1 innings against the Pirates, while Addison Reed pitched a six-out save to secure the win for the Mets.
Gsellman (4-3, 5.53 ERA) struck out six batters and walked two. He allowed runs in the second and third innings, but limited the damage thereafter despite throwing a season-high 109 pitches less than a week after he threw a then-season-high 105 pitches against the Milwaukee Brewers.
Fernando Salas, Jerry Blevins, and Reed combined to pitch 3.2 scoreless innings in relief for the Mets. Reed allowed two hits and a walk, but allowed no runs to earn his eighth save of the season.
Mets general manager Sandy Alderson said earlier in the week that the Mets plan to move Gsellman to the bullpen once Steven Matz and Seth Lugo return from the disabled list. Gsellman has made 10 starts and three relief appearances for the Mets this season.
Gsellman, 23, is 7-5 with a 4.20 ERA in 20 games for the Mets in his young career.