Blue Jays ace Roy Halladay left his start against visiting Florida after apparently injuring his groin.

Halladay grimaced after throwing his second pitch in the third inning last night. Catcher Rod Barajas went to the mound, then motioned to the dugout, calling manager Cito Gaston and trainer George Poulis to join him.

Toronto's infielders huddled on the mound as Halladay spoke with Gaston and Poulis. Halladay threw one warm-up pitch, then flipped the ball to Barajas and headed to the dugout.

The Jays said Halladay tweaked a muscle in his right groin.

Halladay, whose next scheduled start is Wednesday against the Phillies, leads the major leagues with 10 wins and 103 innings pitched. He has won seven straight decisions and entered last night's game having thrown back-to-back complete games.

Cody Ross hit a tiebreaking grand slam, Chris Coghlan had a career-high four hits and the Marlins went on to beat the Blue Jays, 7-3.

In other interleague games:

* At New York's Yankee Stadium, second baseman Luis Castillo dropped Alex Rodriguez' lazy popup with two outs in the ninth inning as two runs scored, and the Yankees escaped with a wild, 9-8 victory over the Mets.

* At Milwaukee, Corey Hart drove in three runs on a double and a triple and saved two more with a diving catch for the Brewers, who rallied to beat the Chicago White Sox, 7-2. White Sox first baseman Paul Konerko was scratched from the starting lineup with a nagging thumb injury.

* At Baltimore, Brian McCann tied a career high with four hits and Tommy Hanson (1-0) recorded his first major league victory as the Atlanta Braves beat the Orioles, 7-2.

* At San Francisco, Tim Lincecum (6-1) threw a seven-hitter and Aaron Rowand drove in two runs as the Giants beat the Oakland Athletics, 3-0.

* At Pittsburgh, Rick Porcello threw seven crisp innings and had a pair of RBI singles, leading the Detroit Tigers, 3-1, over the Pittsburgh Pirates.

* At Cleveland, Shin-Soo Choo drove in three runs as the Indians beat the St. Louis Cardinals, 7-3.

* At Chicago, Joe Mauer had a homer and three RBI and the Minnesota Twins beat the Cubs, 7-4.

* At Kansas City, Luke Hochevar (3-2) tossed a three-hitter in his first career complete game and Alberto Callapso hit a two-run homer, helping the Royals beat the Cincinnati Reds, 4-1.

* At Arlington, Texas, Vicente Padilla (5-3) worked five effective innings, Hank Blalock homered and the Rangers beat the Los Angeles Dodgers, 6-0.

* At St. Petersburg, Fla. Gabe Kapler hit a pinch-hit home run that snapped an eighth-inning tie and gave the Tampa Bay Rays a 4-3 win over the Washington Nationals.

* At Denver, Ubaldo Jimenez (5-6) pitched the second complete game of his career and had an RBI single to help the Colorado Rockies beat the Seattle Mariners, 6-4.

In an NL game:

* At Phoenix, Mark Reynolds homered and doubled to drive in five runs as the Arizona Diamondbacks beat the Houston Astros, 8-1.

Noteworthy

* San Diego Padres ace righthander Jake Peavy is expected to miss a month because of his injured ankle. He was scratched from today's start against the Los Angeles Angels after an MRI exam showed that the tibialis tendon behind his right ankle was torn.

* Cleveland Indians pitcher Anthony Reyes is expected to miss 12 to 18 months after having surgery on his right elbow.

* Fernando Nieve will start for the New York Mets at Yankee Stadium today after John Maine went on the 15-day disabled list with shoulder weakness.

* The Pirates agreed to terms with Boston College catcher Tony Sanchez, the fourth pick in the draft, who will receive a signing bonus of $2.5 million.

* The Tigers placed righthander Jeremy Bonderman on the 15-day disabled list with a sore shoulder and recalled pitcher Ryan Perry from Toledo. *