The New York Mets will call up top pitching prospect Nolan McLean to make his MLB debut on Saturday, reports SNY’s Andy Martino. He’ll step into the rotation spot vacated by Frankie Montas’ move to the bullpen. Jon Heyman of the New York Post reported earlier Wednesday morning that righty Paul Blackburn was also headed to the bullpen when he’s ready to be reinstated from the injured list, setting the stage for either McLean or fellow prospect Brandon Sproat to make his debut. As we noted on Tuesday, when the Mets moved Montas to the ’pen, the Saturday start aligns far better with McLean’s turn in the Triple-A rotation than with that of Sproat. McLean has also outpitched Sproat this season, though both well-regarded prospects have excelled recently. The timing of the move likely isn’t a coincidence. Saturday marks the first day on the calendar where there’s not enough time remaining for players to accrue enough service to exhaust their rookie eligibility. By waiting until Saturday to promote McLean, the Mets
