Jonah Tong might not look like a prototypical starting pitcher in today’s game, but a sub-2.00 ERA in 22 starts between Double-A and Triple-A says otherwise. Now, the Mets are rewarding their top pitching prospect with a big-league call-up Friday night against the Miami Marlins.

With the Mets in the midst of a stretch of 16 games without an off-day and the starting pitchers still struggling to provide length, the club decided to add a sixth starter this weekend. Instead of using an opener in front of a bulk reliever in the middle of a playoff chase, the Mets are finally giving their pitching prospects some Major League looks.

“I think it’s all about him dominating the minor leagues,” manager Carlos Mendoza said Tuesday at Citi Field. “You could make the case that after Double-A, you w

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