CINCINNATI — When Brandon Sproat arrived at Great American Ballpark on Saturday afternoon, it felt like his first day at a new school. Luckily, Nolan McLean and Jonah Tong were in his new class.

The Mets will graduate another pitcher to the big leagues Sunday afternoon when Sproat, the club’s fifth-ranked prospect according to MLB Pipeline, makes his big league debut against the Cincinnati Reds, joining fellow rookies McLean and Tong in the rotation.

“It’s the future,” Sproat’s former Triple-A Syracuse teammate Ronny Mauricio told the Daily News on Saturday. “We’re the future.”

The future could be here for the Mets rotation, but there are no guarantees. So far, McLean has handled pitching in a playoff race like a seasoned veteran, going 4-0 in his first four Major League starts. T

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