MILWAUKEE — Tony Gwynn Jr. smiled and shook Brewers principal owner Mark Attanasio's hand. Unfortunately, he had the same answer for Attanasio about his tight left hamstring as everyone else.

"It's sore, still very sore," Gwynn said.

Gwynn was out of the lineup today in Milwaukee's home opener against with the San Francisco Giants. He wouldn't have started in center field anyway, with Gabe Kapler facing off against left-handed starter Jonathan Sanchez, but Gwynn may be out longer.

"I'm trying to keep a positive mind-set about it," said Gwynn, who was expected to get extended playing time while Mike Cameron misses the first 25 games after being suspended for testing positive for a banned stimulant. "I'm trying to stay positive. Hopefully every day it'll get better and I won't be out too long."

Manager Ned Yost said he wasn't sure if Gwynn would need to go on the 15-day disabled list with the injury.

"I don't know, we're kind of taking it day-by-day," Yost said.

Gwynn left the game after the top of the sixth in a 6-3 loss Thursday to the Chicago Cubs. His first series to that point had been a success. Gwynn hit .571, drove in the game-winning run on Monday with a sacrifice fly and stole a base.

"My strength is good. They did some hamstring tests. My strength is really good, I'm just really sore for whatever reason," said Gwynn, who had a heat pack on the injury earlier in the day.

Gwynn, who battled a hamstring problem late last season while hitting .260 with 10 RBIs and eight stolen bases in 69 games, said the trainers told him there were no tears or holes in the hamstring.

"Hopefully, tomorrow it'll be better," Gwynn said. "As long as we keep getting better every day I can live with that."