It appears the Mets again will rely on an unproven rookie to stabilize their rotation, and will do so in what could be one of their biggest series of the year.

Hard-throwing righthander Brandon Sproat will be called up to start against the Reds on Sunday, according to published reports; Newsday did not independently confirm the move.

Sproat will join Nolan McLean and Jonah Tong as the latest young prospects to make their debuts in a pivotal stretch run for a team that entered Thursday in the third and final wild-card spot. The Giants trail them by four games and the Reds, who will face the Mets (75-65) in a three-game set this weekend, are five games out.

Sproat, 24 and the organization’s No. 5 prospect, was 8-6 with Triple-A Syracuse this year, pitching to a 4.24 ERA. He’s had more suc

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