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08/31/10 1:55 AM EST

Uggla day-to-day with right groin strain

MIAMI -- Dan Uggla tried to play through the discomfort. But after stretching with the team, it was clear he wasn't ready to go.

So late Monday afternoon, Uggla was scratched from the lineup due to a right groin strain. He is listed as day-to-day, but Marlins manager Edwin Rodriguez noted the team would be cautious with the power-hitting second baseman.

"I'm optimistic," Uggla said after the Marlins lost 9-3 to the Nationals on Monday. "We will have to see how I feel when I wake up in the morning."

Rodriguez would welcome good news from his slugger.

"After he went out and stretched, he wasn't 100 percent," Rodriguez said.

Emilio Bonifacio replaced Uggla at second base, while Gaby Sanchez is filling in at the cleanup spot.

Uggla informed the team after Sunday's 7-6 loss at Atlanta that he was dealing with a groin issue. Known for his all-out play, Uggla hit a double and reached on an infield single against the Braves.

On his infield single, he slid head-first into the base.

"He was sore yesterday after the game," Rodriguez said.

Even though Uggla, who was the only Marlin to start all 129 games this season, is listed as day-to-day, Rodriguez said you have to be careful with leg injuries.

"When talking about a leg injury, it's hard for me to believe," Rodriguez said. The skipper is preparing for the possibility Uggla could be out a few days.

Uggla is having a career year, batting .286 with 29 homers and 83 RBIs. He is one home run away from being the first second baseman in MLB history to have four 30 home run seasons.

Joe Frisaro is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.