Even before he took the mound, Roger Clemens could tell something was wrong. The Minnesota Twins knew it, too.

Clemens pulled himself after just seven pitches, leaving with a strained right groin Tuesday night in Toronto's 12-2 loss at the Metrodome.Clemens said he hurt himself while warming up in the bullpen. He returned to the clubhouse, and his condition did not improve.

"I came in to do some stretching and as we stretched it, I got a little sharp pain and thought, `Maybe I better not do that,' " Clemens said.

Blue Jays trainer Tommy Craig said it was a mild strain, and compared the injury to one that caused Clemens to miss one start last April.

"I think it was smart on his part to shut it down rather than trying to throw through it and end up missing two or three weeks," Craig said.

Clemens said he doesn't expect Clemens (1-1) wound up as the losing pitcher in the shortest start of his career.

"We knew something was wrong because he didn't warm up like he usually does," Twins manager Tom Kelly said. "We didn't know if he was sick or what."

Clemens walked leadoff hitter Matt Lawton on five pitches and fell behind 2-0 to Brent Gates before calling time. Manager Tim Johnson went to the mound and took out the Toronto ace.

"Normally when Clemens throws his high pitch you can barely see it," Lawton said. "But I had no problem picking up his first pitch. It was one of the rare times when I was actually hoping Clemens would throw me a strike."

Robert Person relieved and walked Gates, a walk charged to Clemens. Both runners eventually scored in a four-run first inning, keyed by Marty Cordova's two-run triple.

Bob Tewksbury (1-1) gave up one run and two hits with no walks in seven innings. He retired his final 18 batters.

YANKEES 13, MARINERS 7: Chuck Knoblauch homered on the first pitch of the game, and Darryl Strawberry and Jorge Posada also connected in a six-run first inning at the Kingdome.

Strawberry hit two long home runs and a double and drove in four runs. He had not homered since 1996 after spending most of last year on the disabled list.

David Wells (1-1) pitched New York to just its fifth win in its last 23 games at Seattle. Alex Rodriguez and Robert Perez homered for the Mariners.

ANGELS 6, RED SOX 1: Ken Hill shut out Boston on five hits for eight innings and Phil Nevin and Darin Erstad homered at Anaheim.

Hill (2-0) walked none, struck out four and retired 13 of his last 14 batters.

ORIOLES 11, ROYALS 7: Joe Carter drove in four runs and Baltimore won its sixth straight game, spoiling Kansas City's home opener.

Eric Davis and Lenny Webster homered and Roberto Alomar had four hits for the Orioles, whose only loss came against the Royals on opening day. Cal Ripken got his 2,721st hit, tying Lou Gehrig for 45th place on the career list.

TIGERS 3, DEVIL RAYS 1: Detroit stopped a five-game losing streak before a home opener crowd of 45,768, the first sellout at Tiger Stadium since April 11, 1994.

Rolando Arrojo, who pitched Tampa Bay past Detroit last week in the expansion team's first game, did not fare so well in the rematch. The Tigers scored three times in 5 2-3 innings against the Cuban defector.

NATIONAL LEAGUE

BREWERS 6, EXPOS 4: At County Stadium, Jeromy Burnitz and Jose Valentin homered as Milwaukee won its sixth straight and dropped the Expos - another payroll purge victim - to 0-7.

PHILLIES 9, MARLINS 8: At the Vet, Philadelphia rallied from an 8-4 deficit, overcoming a grand slam and five RBIs by Derreck Lee.

DODGERS 9, DIAMONDBACKS 1: Eric Young hit a two-out, two-run double as Los Angeles broke out of a tie with a five-run fourth inning in the home opener at Dodger Stadium.

Chan Ho Park (1-0) scattered seven hits in six innings, dropping the expansion Diamondbacks to 1-6.

BRAVES 11, PIRATES 3: Chipper Jones homered twice off Jason Schmidt (1-1) in the first three innings at Three Rivers Stadium, where a sellout crowd of 43,268 saw the Pirates lose their fifth straight home opener.

CARDINALS 12, ROCKIES 11: Tom Lampkin homered and drove in four runs in the Coors Field opener. St. Louis built a 9-1 lead off Pedro Astacio (1-1) and Mike DeJean, withstood a seven-run sixth inning and scored three more runs in the seventh.

Mark McGwire, who hit homers in his first four games this season, went homerless for the second straight game but drove in two runs with a groundout and sacrifice fly.

GIANTS 5, ASTROS 4: Pinch-hitter Rey Sanchez singled in the winning run off Billy Wagner in the 10th as San Francisco won its home opener. J.T. Snow slid around the tag of catcher Tony Eusebio to score the winning run.

Robb Nen (1-0) pitched two perfect innings, striking out two to complete a five-hitter.

PADRES 3, REDS 2: Carlos Hernandez tied the score with a two-out, two-run homer in the ninth, and Greg Vaughn hit a sacrifice fly off Jeff Shaw in the 10th as San Diego won its home opener.

METS 3, CUBS 2: Al Leiter (1-1) hit a two-run double at Wrigley Field for his first extra-base hit in 122 career at-bats and got his first victory for New York - he was part of Florida's payroll dump. In a game interrupted for 1:54 because of rain, he also stopped Chicago's six-game winning streak.