Philadelphia Pedro Martinez felt a twinge in his calf before the game and felt the effects during a terrible first inning.
The New York Mets only could hope a bad outing was the worst of his problems.
Martinez strained his right calf and left after giving up six runs Monday night, and the Philadelphia Phillies went on to romp, 13-0.
Martinez was listed as day-to-day. The Mets said the three-time Cy Young winner - who missed a month earlier this season because of an inflamed right hip - felt the strain while warming up.
Mets manager Willie Randolph said Martinez left for New York and would be examined today. Randolph wanted to wait until he had test results to determine if Martinez would make his next start.
"He felt a twinge out there, but he felt like if it got loose, he could go out there and give us what he had," Randolph said.
Martinez (9-5) gave up six runs in an opening inning for the first time in his career, the Elias Sports Bureau said. It was his second-shortest start ever - on June 20, 1995, he got only two outs for Montreal while allowing five runs to Houston.
"The concern, obviously, is that he's OK," Randolph said. "I want to wait and see when the dust settles where we stand."
While the Mets are worried about their present ace, it was another strong outing for Philadelphia's future one.
Cole Hamels (5-6) pitched eight shutout innings as the Phillies kept up their pursuit of the wild-card spot.
Jimmy Rollins, Dave Dellucci and Shane Victorino homered. Rollins' three-run homer shot was his 18th, setting a single-season record for Phillies shortstops.
Braves 10, Nationals 4
Washington - Matt Diaz tied an NL record by getting a hit in 10 straight at-bats, and Chipper Jones homered in three straight plate appearances for Atlanta.
Diaz went 4-for-5 with a homer, and Jones finished with four hits and five RBIs.
Diaz hit a two-run homer in the second and singled in the fourth and fifth Monday, all off starter Ramon Ortiz (9-10). Diaz went 4-for-4 Sunday against Milwaukee and was 2-for-2 on Saturday.
His streak ended with a groundout to short off Chris Schroder in the ninth.
Pirates 4, Brewers 2
Pittsburgh - Jeromy Burnitz and Jose Castillo hit solo home runs, and Pittsburgh won its fourth game in a row. Victor Santos (5-7) won while making a spot start in place of Shawn Chacon, who had a sore knee.
Cubs 3, Astros 0
Houston - Carlos Zambrano dominated Houston again, and Phil Nevin homered and drove in all three runs to lead the Cubs over the Astros.
Rockies 4, Diamondbacks 3
Denver - Brad Hawpe hit a two-out RBI single in the ninth to score Jamey Carroll and give Colorado a victory.
Hawpe was 0-4 with two strikeouts before hitting a 2-1 pitch from Tony Pena (3-2) up the middle.
Dodgers 4, Marlins 2
Los Angeles - Nomar Garciaparra homered and drove in three runs against Dontrelle Willis, and the Dodgers won for the 16th time in 17 games.
The NL West leaders have won five straight and have their the first 16-1 stretch since the franchise relocated from Brooklyn in 1958.
Giants 1, Padres 0
San Diego - Eliezer Alfonzo drove in the only run of the game with an RBI single in the fifth inning, and Brad Hennessey (5-2) combined with five San Francisco relievers on a five-hitter.