Peterson has posted a 3.77 ERA, 1.56 WHIP and 15:7 K:BB through 14.1 innings over three starts for Double-A Binghamton.
The 23-year-old southpaw has uncharacteristically fought his control a little, but he's once again been tough to take deep -- Peterson's served up only one homer, just the third he's given up in his pro career. An improved strikeout rate will be the key to his future success. If he continues fanning better than a batter an inning, he could have mid-rotation upside in the majors.
Peterson was invited to the Mets' big-league camp Thursday.
Peterson still hasn't reached Double-A, so he isn't a real candidate to make the team's Opening Day roster. The 23-year-old made 22 starts between Low-A Columbia and High-A St. Lucie in 2018, posting a combined 3.16 ERA, 1.17 WHIP and 115:30 K:BB across 128 innings.
Peterson (4-6) picked up the win for High-A St. Lucie in Friday's victory over Dunedin, allowing two hits and three walks over five scoreless innings while striking out five.
The Mets' No. 10 fantasy prospect had a rough beginning to his tenure in the Florida State League after getting promoted in June, but Peterson seems to have figured something out, posting a 1.06 ERA and 20:4 K:BB in 17 innings over his last three starts. The 22-year-old southpaw will likely remain with St. Lucie through the rest of the season, putting him in line for his first crack at the high minors in 2019 and a possible big-league debut in 2020.
The Mets promoted Peterson to High-A St. Lucie on Sunday, Anthony DiComo of MLB.com reports.
Peterson, the Mets' top overall selection in the 2017 first-year player draft, didn't endure many difficulties during his time in the South Atlantic League, as he tallied a 1.82 ERA, 0.96 WHIP and 57:11 K:BB in 59.1 innings for Low-A Columbia. The 6-foot-6 lefty doesn't boast premium heat -- his fastball typically sits in the 90-to-92 mile-per-hour range -- but thanks in part to a deceptive delivery and long arms that give him extra extension toward the plate, his velocity plays up. He should continue to find success in the Florida State League and further solidify his standing as one of the top arms in the Mets' system.
Peterson gave up two runs (one earned) and struck out seven over seven innings in his start Sunday for Low-A Columbia in its 2-1 loss to Charleston.
It was yet another strong showing from Peterson, who has submitted a 1.91 ERA and 1.02 WHIP and has yielded just one home run in 37.2 innings this season. The Mets' 2017 first-round pick is lauded for his deep repertoire and strike-throwing ability, though his lack of a big fastball probably limits his ceiling to that of a mid-rotation starter.
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