Mets moving Sean Manaea to bullpen

The Mets are moving left-hander Sean Manaea to the bullpen, according to a report from Will Sammon and Tim Britton of The Athletic. Manaea told reporters before today’s game against the Rangers that he’s set to be available out of the bullpen during the game, and that if he’s not used in tonight’s game he’s likely to be used in relief of starter Clay Holmes for Tuesday’s series opener against the Padres.

The Mets, as noted by Sammon and Britton, have used a six-man rotation recently thanks to the promotions of rookies Jonah Tong, Brandon Sproat, Nolan McLean. With days off both tomorrow and next Monday, however, the Mets are opting to go back down to five starters through the end of the regular season. McLean (1.42 ERA in five starts) and Sproat (2.25 ERA in two starts) have both been nothing short of excellent, making it an easy decision to leave them both in the rotation alongside Holmes and Peterson. That left one spot in the rotation for Manaea and Tong, and New York will stick with the 22-year-old despite his six-run blow-up outing against the Rangers on Friday.

It’s hard to view that as anything other than a reflection of Manaea’s poor performance this year. The lefty was crucial to New York’s success in both the regular season and postseason last year, but was sidelined until just before the All-Star break by an oblique strain and a loose body in his elbow. His return to the mound hasn’t exactly inspired confidence, as he’s pitched to a 5.76 ERA in 50 innings of work across ten starts. While his 29.2% strikeout rate is incredibly impressive, particularly against a 4.6% walk rate, that’s led only to great peripherals like his 3.03 SIERA.

Manaea’s actual results have been well below par, and while much of that can be attributed to poor luck when it comes to sequencing and batted balls another real issue for the lefty has been keeping the ball in the park. He’s surrendered a career-high 9.4% barrel rate this year, and that’s led to ten home runs allowed this season. Perhaps move into a relief role can help him get things back on track over the final weeks of the regular season. If the Mets manage to make it to October despite their recent eight-game skid, Manaea will surely be crucial to keeping the pitching staff afloat regardless of what role he ends up pitching in.

Perhaps, if pitching in shorter bursts can help Manaea avoid the long ball over the next few weeks, he’ll be able to help stabilize a bullpen that has struggled badly of late. Ryan Helsley has never looked quite right since leaving the Cardinals, Reed Garrett and Ryne Stanek have faltered, and even Edwin Diaz blew a save and found himself on the hook for the loss in last night’s game against Texas. Typical pitching roles often go out the window in the postseason, and if Manaea is able to get big outs for the Mets in October out of the bullpen, they’d likely be happy to take that production even if it means him not being part of the rotation mix.

Another potential x-factor for the Mets is right-hander Kodai Senga, who has pitched like a front-of-the-rotation starter in the past but was optioned to Triple-A earlier this month after a string of eight starts where he pitched to a 6.56 ERA. Those starts came after a stint on the injured list due to a hamstring strain, however, and Senga looked incredible in six innings of work for Syracuse on Friday night. Perhaps he could bump Tong from the big league rotation before the end of the year if he continues to look good, and even if not Senga figures to be part of the Mets’ postseason pitching plans in some capacity if they make it there.