In my opinion, the bullpen was a strength in 2021. Especially in the second half, the Mets had no starter outside of Marcus Stroman that they could rely upon to give them innings. That means the bullpen was usually tasked with getting between 10-15 outs per game at least.
Unfortunately, the most consistent piece of the bullpen from last season in Aaron Loup signed with the Angels. That leaves a big hole in the bullpen that the Mets have yet to replace. When the lockout resumes I hope they do address the bullpen but it still has some very good pieces in it as is. Most of the eight-man bullpen has been figured out but the back half of it is very up in the air.
6) Edwin Diaz
7) Seth Lugo
8) Trevor May
9) Miguel Castro
10) Drew Smith
11) Trevor Williams
12) David Peterson
13) Sean Reid-Foley
I believe that Diaz, Lugo, May, Castro, and Smith are locks no matter what. Diaz is the undisputed closer, and rightfully so. Lugo and May will be critical late game arms. Castro and Smith both looked really impressive last season and will be in the mix in some way. The rest of the bullpen I believe is a toss-up.
The Mets have eight pitchers who are not listed as a starter or reliever on the 40-man roster. Out of those eight, the only ones who I feel would have any sort of chance at a roster spot are Yennsy Diaz, Joey Lucchesi, Jake Reed, and Jordan Yamamoto.
Lucchesi is injured so he's not going to be on the roster. The other three pitchers had their moments, but I don't think are better than the three I believe get those bullpen spots.
Trevor Williams was acquired in the Javier Baez trade. As a Met, he posted a 3.06 ERA in 10 appearances (three starts). He kept the Mets in games and kept the ball in the ballpark (0.3 HR/9). The Mets also decided to tender him, so he will be making around $3.75 million dollars according to spotrac. Hard to keep a guy who's making almost $4 million dollars in the Minor Leagues.
Sean Reid-Foley's season was ruined by injuries and two bad outings. In his other 11 outings, he allowed just three runs in 18.2 innings pitched. He struck out 11.3/9 overall. He's a guy the Mets were able to rely upon for the beginning of the season to give them multiple innings whenever they needed it. I think that'll be good for their bullpen.
David Peterson I think gets the last bullpen spot for a couple of reasons. First, he's a lefty. The only other left-handers on the 40-man roster are Lucchesi and Thomas Szapucki. Lucchesi is hurt and Szapucki allowed six runs in 3.2 innings in his only big-league appearance. In a division with many talented left-handed hitters, the Mets might be able to rely on Peterson to give length and also potentially get some of those hitters out. He's also just a flat-out more talented pitcher than those who won't make the team.