Now the Chicago Cubs have two injured aces.

Mark Prior will be out indefinitely because of inflammation in his right elbow, joining fellow fastballer Kerry Wood on the sideline for a while.

Wood, slated to start on opening day, is out with bursitis in his right shoulder.

Cubs trainer Mark O’Neal said Monday the 24-year-old Prior had some inflammation in the elbow joint and a little irritation to the ulnar nerve.

Prior, an 18-game winner in 2003, missed the first two months of last season because of right Achilles’ tendinitis and stiffness in his right elbow. In July, he missed a start because of discomfort in the elbow. But Prior and O’Neal both said the current injury was not related to last year’s problem.

Prior made his Cactus League debut Thursday, when he threw three innings against Seattle. He said Monday that while doing some routine postgame exercises, he felt discomfort in the elbow.

Cubs general manager Jim Hendry said Prior saw elbow specialist Dr. Lewis Yocum last weekend and had a precautionary MRI on Sunday.

Prior was supposed to pitch Tuesday against Kansas City, but will miss that start. O’Neal said that in addition to rest, Prior was taking anti-inflammatory medication, and the Cubs would see how he responded to the rest and medication before determining when he would begin throwing again.

Yankees closer Mariano Rivera also has a sore right elbow, but his problem is not considered serious. He will be out at least a few days with mild bursitis.

At Bradenton, Fla., Todd Ritchie told the Pirates that he planned to retire, ending his comeback bid after missing nearly two seasons because of a right shoulder injury.

The Los Angeles Dodgers got much better news about Brad Penny in Vero Beach, Fla., where he had an impressive 65-pitch bullpen session.

In spring training games:

Yankees 5, Pirates 2

At Tampa, Carl Pavano allowed one hit in four scoreless innings, and Tino Martinez hit a two-run homer.

Marlins 4, Twins 3, 11 innings

At Fort Myers, Fla., Dontrelle Willis pitched four strong innings for Florida, giving up just one hit and one unearned run.

Braves 5, Cardinals 1

At Jupiter, Fla., Raul Mondesi, Rafael Furcal and Andruw Jones homered off Jeff Suppan. John Thomson allowed three hits in four shutout innings.

Orioles 5, Red Sox 3

At Fort Lauderdale, Fla., Miguel Tejada had three hits, and Chris Stynes tripled home the tiebreaking run in the seventh inning.

Phillies 10, Blue Jays 8

At Clearwater, Fla., Toronto rookie starter Gustavo Chacin was roughed up for the second outing in a row.

Reds (ss) 7, Tigers (ss) 5

At Sarasota, Fla., Eric Milton worked five strong innings for Cincinnati, retiring 11 of his last 12 batters.

Tigers (ss) 3, Reds (ss) 2

At Lakeland, Fla., Magglio Ordonez made his debut in right field for the Tigers. He went 1-for-3 at the plate.

Angels 10, Rangers 6

At Tempe, Ariz., Chan Ho Park pitched four shutout innings for Texas. Park allowed one hit, walked none and struck out two.

Padres 4, Mariners (ss) 3

At Peoria, Ariz., Seattle’s Scott Spiezio hit his first homer of the spring, a two-run shot off Brian Lawrence.

Rockies 11, Diamondbacks 8

At Tucson, Ariz., Tim Olson hit his second grand slam of spring to lead Colorado.

White Sox 9, Cubs 5

At Mesa, Aaron Rowand homered twice, and Juan Uribe, Joe Borchard, A.J. Pierzynski and Paul Konerko each hit home runs for the White Sox with the aid of a strong wind.