Because he'll hit more balls over the fence than he will have bunts.

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The career saves leader with 608, Rivera said the biggest tests will be fielding bunts and covering first base.

WSJ: Sabathia throws off the mound

"That's what I wanted to do, field some bunts, go after some balls in between first and the mound, " Rivera said.

WSJ: Yankees' Rivera throws 1st simulated game

He directed his own slugging first baseman, Carlos Pena, to drop more bunts than any other power hitter over the past decade.

WSJ: Mark Teixeira Considers Using the Bunt

That meant converting batted balls into outs with sturdy defense was essential, and that outs should not be wasted on risky plays like bunts, steals and hit-and-runs.

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