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Boston, MA (Sports Network) - While the New York Yankees are desperately trying to reach the postseason, Boston's motivation is only the rival on the other side of the diamond.

That was plenty good enough on Tuesday at Fenway.

Jacoby Ellsbury's fourth hit of the game, a solid single to right, plated Pedro Ciriaco with the winning run in the ninth, as Boston edged the Yankees, 4-3, in the first contest of a three-game set.

Dustin Pedroia finished with three hits, including a solo home run, and two runs batted in, while Ciriaco posted two hits and scored twice for Boston, which had dropped four straight coming into the contest.

Jon Lester labored through 5 1/3 frames, throwing just 55 of his 102 pitches for strikes, walking seven and giving up three runs and five hits. Andrew Bailey (1-0) pitched a scoreless ninth for the victory.

Nick Swisher finished with two hits and Derek Jeter drove in two runs for the Yankees, who dropped into a tie for the American League East lead with Baltimore, which downed Tampa Bay, 9-2, earlier on Tuesday.

Hiroki Kuroda gave up three runs on eight hits in 6 1/3 frames, but David Robertson (1-7) lost it in the ninth, giving up the winning run after pitching a scoreless eighth.

For a complete game box score, click here

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