The Mets have placed left-hander David Peterson on the 10-day injured list with shoulder fatigue, Tim Healey of Newsday tweets. In other moves, they recalled righties Drew Smith and Corey Oswalt and optioned RHP Franklyn Kilome.

Peterson exited his most recent start last Thursday with shoulder discomfort, though he was supposed to take the ball tonight before this news came down. The Mets will presumably start Oswalt instead, and if their career numbers to this point are any indication, the drop-off will be significant.

While Peterson is only in first season, he has been one of the few bright spots out of the Mets’ rotation in 2020. Peterson has been one of the game’s best rookies so far, in fact, having logged a 2.91 ERA/4.00 FIP with 7.06 K/9 and 3.32 BB/9 in 21 2/3 innings. Meanwhile, over 75 1/3 lifetime frames, Oswalt has limped to a 6.69 ERA/6.75 FIP.

The hope is that Peterson will return in short order, but shoulder injuries are ominous and time’s already running out on this season. Furthermore, the Mets have gotten out to a weak 10-14 start thanks in no small part to what has become a questionable rotation behind Jacob deGrom and Peterson. It looked promising a few months back, but Noah Syndergaard has since undergone Tommy John surgery and Marcus Stroman decided to opt out. Meanwhile, offseason signings Rick Porcello and Michael Wacha haven’t prevented runs at acceptable clips, nor has holdover Steven Matz. The Mets did just add reliever Robert Gsellman to their starting staff, but he only threw 1 2/3 innings in a start against the Marlins on Monday.

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