David Peterson: Everything you need to know

Peterson has been demoted to the Mets' bullpen, Anthony DiComo of MLB.com reports. Peterson has had a disastrous couple months while splitting his time between starting pitcher and bulk reliever, holding a 5.57 ERA, 1.67 WHIP and 53:23 K:BB over 53.1 innings. He will be available to pitch in relief beginning Sunday. Sean Manaea is taking Peterson's spot as a starter/bulk reliever.

Peterson (3-5) took the loss against the Reds on Tuesday, allowing six runs on 11 hits and three walks while striking out four across five innings. Peterson put the Mets in a hole early after yielding an RBI double to Eugenio Suarez in the first inning before giving up another three runs in the fourth. It could have been a worse stat line for Peterson, given that he gave up at least two baserunners in four of the six innings he pitched in. The 11 hits he yielded were a season high, and the six earned runs were his most in a start since April 29 against the Nationals (seven). Peterson now sits at a 5.57 ERA and 1.67 WHIP over 53.1 innings this season, and the 66 hits he's given up is tied for fifth-most in the National League. His next start is lined up for next week on the road against the Mariners.

Peterson (3-4) notched the win Thursday against the Nationals, allowing one run on four hits and three walks in five innings. He struck out three. Peterson weathered an early storm Thursday, stranding the base loaded during the opening frame, and it was mostly smooth sailing thereafter. The 30-year-old southpaw has been erratic overall for the Mets this season, giving up at least four runs on four occasions, but he's yielded two or fewer runs in four consecutive outings during the month of May. Peterson will try to further improve on his 5.03 ERA, 1.55 WHIP and 49:20 K:BB over 48.1 innings in his next scheduled appearance against the Reds.