BALTIMORE — David Ortiz wasn't in the starting lineup Sunday, and Boston's DH could only hope his injury is a minor setback.

Ortiz sprained his wrist Saturday while swinging at a pitch in Boston's 6-3 win over Baltimore. He left for a pinch hitter with the count full.

"It feels the same," Ortiz said Sunday. "We'll see what the doctors say. I got to get an MRI."

The examination is expected to take place in Boston on Monday, according to bench coach Brad Mills, who subbed for Terry Francona during Sunday's 9-4 victory.

"We're going to send him back to Boston tomorrow," Mills said after the game. "Kind of precautionary right now. Get an MRI, and get him looked at, and we'll go from there and see what happens."

Ortiz had missed only four games before Sunday. He is batting .252 and leads the Red Sox with 13 homers and 43 RBIs.

Mills used Manny Ramirez at DH on Sunday. Ramirez hit his 500th home run on Saturday night and added No. 501 on Sunday.

PRIOR TO HAVE SURGERY: San Diego Padres pitcher Mark Prior will undergo season-ending surgery on his injured right shoulder, the latest medical setback to a once-promising career. Padres manager Bud Black announced the decision to operate before Sunday's game against the San Francisco Giants. Prior, one of the top young pitchers in the game for the Chicago Cubs just a few years ago, has not pitched in the majors since Aug. 10, 2006. He had been trying to make a comeback with his hometown Padres this season, but his rehab process was shut down at extended spring training about two weeks ago when he had more soreness in the shoulder. Prior, 27, had surgery on the same shoulder in April 2007 while with the Cubs.

The operation to repair the anterior capsule in Prior's shoulder will be performed at Scripps Clinic as early as this week by team orthopedics Dr. Heinz Hoenecke and Dr. Jan Fronek.

The Padres won't know when, or if, Prior will be able to pitch again until after the operation.

YANKEES MOVES: The New York Yankees designated infielder Morgan Ensberg for assignment Sunday and recalled right-hander Scott Patterson for another option out of the bullpen. Ensberg last played six days ago. Patterson allowed one run over 1 1/3 innings in his major league debut Sunday against Minnesota.