FORT LAUDERDALE, Fla. (AP) _ Mark McGwire homered for the second time in two days and had four RBIs, and the St. Louis Cardinals scored four runs in the 10th inning to beat the Baltimore Orioles 10-6 Tuesday.

McGwire doubled in a run in the first inning and hit a three-run homer in the fifth. Both hits came off Sidney Ponson, who yielded five runs on seven hits in five innings.

``It was a nice little slider,'' said McGwire of his home run, an opposite field drive to right-center.

``Two sliders up and he got a home run and a double out of it,'' Ponson said.

McGwire, who homered on Monday against Philadelphia, has three homers and a team-high 13 RBIs this spring. He went 2-for-3 to up his batting average to .355.

Ray Lankford also hit his second homer in two games for the Cardinals, a solo shot in the fourth off Ponson.

``A 3-2 fastball right down the middle,'' Ponson said. ``During the season I probably don't throw him a 3-2 fastball. But it's spring training, I tried to sneak one in and he hit it.''

The Cardinals broke a 6-6 tie in the 10th against Luis Mercedes, whose streak of 13 scoreless innings came to an end. Two runs scored on a throwing error by Jesse Garcia, and Shawon Dunston and Larry Sutton added RBI singles.

Down 6-3 in the eighth, the Orioles pulled even on a three-run homer by Willie Morales. Baltimore also scored three runs in the third off Kent Bottenfield, ending a string of 18 straight shutout innings by St. Louis starters.

Former Oriole Jesse Orosco, traded to the Cardinals from the New York Mets on Saturday, pitched a scoreless fourth inning.