2) Luis Severino
David Stearns' offseason flier on Luis Severino has been one of the best moves that the Mets' new president of baseball operations has made.
Severino has given the Mets a chance to win every fifth day while leading the team in innings pitched, which is more than you could ask of a guy that looked lost while posting a 6.65 ERA with the Yankees last year. He's helped the Mets survive the loss of Kodai Senga for basically the entire season.
He's also not looked great lately, giving up four runs or more in his last three starts (all Mets losses) after giving up four total in the three before that (all Mets wins). This has pushed his ERA up over 4.00, but the Mets rotation needs Severino to rediscover the form that he displayed earlier in the season.
Severino has left the ball up in the zone too much lately. Through the end of June, he had allowed five more ground balls than fly balls, but since then, those numbers have flipped in a big way, with 21 more fly balls than grounders. This has resulted in the ball leaving the yard at a higher rate, with five home runs allowed in his last three starts, the same number he gave up in his first 10 starts of the season.
Some of the Mets' starters, like Sean Manaea and David Peterson, have been outstanding lately. The Mets need Severino to rejoin them.