The defending World Series champions beat the Tampa Bay Devil Rays 3-2 Saturday night, guaranteeing themselves at least a share of the league's best regular-season record.
But manager Joe Torre's biggest concern was the health of O'Neill, who left in the sixth inning with a bruised right side and lower back after chasing a foul ball into the right-field corner and crashing into a low fence.
X-rays were negative, and O'Neill said with a couple of days rest he should be fine.
"I'm sore, but I don't think there's anything to worry about," said O'Neill, adding that he had the wind knocked out of him. "It's kind of a surprise. I didn't know that wall was there. It's so low, you don't see it."
"I don't think in terms of stats, but to do that in this Yankee uniform knowing the people who have been doing this before me, I feel very honored," Torre said.
New York opens the playoffs Tuesday night at Yankee Stadium, though it's still not crtain whether they will play Cleveland or Texas.
Regardless, the AL East champs are happy to have secured home-field advantage up to the World Series.
"The only thing is you want to make sure we get a chance to use it," Torre said. "I feel very comfortable at Yankee Stadium. I know we play well on the road, but I still like all the ghosts around us."
David Cone (12-9) won for just the second time in 13 starts since pitching a perfect game against the Montreal Expos on July 18. He allowed just two hits, but left in the sixth after walking in two runs that trimmed New York's lead to 3-2.
Mariano Rivera pitched the last 1 2-3 innings for New York to earn his career-high 45th save in 49 opportunities. He hasn't allowed a run in his last 28 appearances.
Davis, who has 19 homers, and Brosius, who's hit 17, both connected off Wilson Alvarez (9-9) in the fifth. The Devil Rays have lost 13 of their last 15 home games.
Cone, 2-5 with six no-decisions over his last 13 starts, limited the Devil Rays to Herbert Perry's two-out, second-inning single through five innings. Dave Martinez was Tampa Bay's only other baserunner during that stretch, drawing a fourth-inning walk before being erased on a double play.
But the Yankees starter faded quickly in the sixth.
Cone became frustrated when a couple of check swings were called balls, instead of strikes.
"There were some close call, but that's no excuse," he said. "The fact of the matter is I was in control, and I let the game get away."
Davis led off the Yankees fifth with the 350th home run of his career. Two outs later, Brosius homered for a 2-0 lead against Alvarez, who walkd two batters before giving up a run-scoring single to Davis that made it 3-0 in the sixth.
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