A.J. Burnett #34 of the New York Yankees pitches against...

A.J. Burnett #34 of the New York Yankees pitches against the Boston Red Sox during the first game of a doubleheader at Yankee Stadium. (Sept. 25, 2011) Credit: Jim McIsaac

The bumbling Boston Red Sox lost yet again, with A.J. Burnett making his most impressive start in nearly three months and Jorge Posada hitting a two-run homer that led the New York Yankees to a 6-2 victory in the opener of Sunday's day-night doubleheader.

Boston's AL wild-card lead was cut to a half-game over Tampa Bay, which beat Toronto 5-2. What was a runaway nine-game advantage heading into play on Sept 4 would be completely gone by the end of Sunday if the Yankees swept.

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