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The Yankees need solid defense from their center fielder.
Curtis Granderson is the youngest outfielder on New York's active roster. Therefore, he's less likely to be on the bench in comparison to guys like Ichiro Suzuki and Andruw Jones.
While Granderson's defense is usually great, his bat has become a liability at this point. I say this because in his last 37 plate appearance (not including yesterday's game), Granderson has struck out 11 times (30 percent of his at-bats).
The Yankees don't have an answer for Curtis' batting woes, but they're willing to sacrifice his bat for his defense right now. However, as evident from the standings, Tampa Bay and Baltimore are very much still alive in claiming the American League East, so No. 14 has to take his game up a notch.