Rapid Reaction: A's 5, Yankees 4

The Yankees may be running out of infielders.

The Yanks fell 5-4 to the Athletics on Sunday, and shortstop Eduardo Nunez left the game with tightness in his left rib cage.

The Yankees finished their 10-game homestand at 7-3 after losing two of three to the A's this weekend. With the tying run at second and the winning run at first in the ninth, Vernon Wells struck out to end the game.

NUNEZ LEAVES: Nunez was taken for an MRI at New York Presbyterian Hospital. He left after the fourth inning and was 0-for-1 with a strikeout. He was replaced by Chris Nelson, who went 0-for-3. The Yankees cannot afford to lose Nunez, as they are already without the starting left side of their infield, Derek Jeter and Alex Rodriguez.

NOT SO DANDY: Starter Andy Pettitte had a second straight rough outing, as he only went five innings and allowed four runs. Pettitte fell behind too many batters and seemingly worked out of the stretch for most of the afternoon. He gave up two homers, the latter a two-run shot by Yoenis Cespedes to put the A's up 4-1 in the fifth, and left after tossing 100 pitches. Pettite received a no-decision.

BOONE GOES THE DYNAMITE: The A's scored the go-ahead run when Josh Donaldson hit a solo shot to left off Boone Logan in the eighth. Logan did not pitch well Sunday, giving up three hits in one-plus innings, including a leadoff double in the ninth. Logan has now yielded 12 hits in just 8 2/3 innings.

SLOW AND STEADY: The Yankees didn't get much going early against Dan Straily, but they got to him as the game went on, eventually sending him to the showeres after 5 1/3 innings. Straily was charged with three earned runs as the Yankees came back to tie the game at 4-4 in the sixth. Lyle Overbay's two-run single against reliever Jerry Blevins knotted the game.

CLAIBORNE DEBUT: Reliever Preston Claiborne made his major league debut Sunday, throwing two perfect innings in the sixth and seventh. Claiborne worked quickly, getting through the pair of innings rather effortlessly.

NEXT UP: The Yankees begin their first road interleague series Tuesday in Colorado when Hiroki Kuroda (4-1, 2.25) opposes Jorge De La Rosa (2-3, 4.18).