3) DJ Stewart
I didn't expect DJ Stewart to be on any list, let alone one that had fans excited about him. He was added this offseason as a depth bat in case of emergency. With the Mets having the season they had, Stewart was one of many journeymen who received an opportunity to play just about every day down the stretch. He was the one who took advantage.
In the month of August there weren't many better hitters on the planet. He slashed .303/.378/.727 with eight home runs and 16 RBI. He hit all eight of those home runs in a 45 at-bat stretch that saw him put up a 1.406 OPS from August 15-30. He capped off the month with a multi-home run game against the Rangers that also saw him make a game-saving catch in right field and win it with a bases loaded hit by pitch.
Stewart was the talk of the town for a couple of weeks in August and even hit two home runs in his first 16 September at-bats, but his slow finish gave Mets fans cause to pause after practically proclaiming him the Daniel Vogelbach replacement.
Stewart had just 14 hits in 74 September at-bats. He'd finish his season with no hits in his last 16 at-bats with six strikeouts. Considering the fact that he hadn't proven much of anything when given an opportunity in prior seasons, watching Stewart finish the season as a non-factor while playing just about every day is concerning.
I still would like the Mets to keep him around as a potential bench bat or minor league depth option, but discussions of him being a starter should be finished.