BOSTON – There were no guarantees issued to Will Warren when he opened the season in the Yankees’ rotation, just a mandate to keep the team in the game. As the rookie right-hander looks up here in September, it is meaningful that he stands alongside Max Fried and Carlos Rodón as the club’s only pitchers to register at least 30 starts.

Yet while Fried and Rodón will be key to the club’s postseason plans, Warren’s role is less clear. There is a real possibility the Yankees will face the Red Sox in a postseason series, and Warren’s results against Boston have not been encouraging, including a six-run first inning in Sunday night’s 6-4 loss at Fenway Park.

This completed a 12-game gauntlet against playoff contenders for the Yankees, with seven wins to show for it. Their remaining series

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