Due to a clerical mix-up, Grissom wasn't eligible to come off the disabled list until Saturday. He was supposed to be put on the DL retroactive to May 18, but when the transaction was sent in on May 20 the move was registered for that date instead.
"It's human error," Giants assistant general manager Ned Colletti said before Friday's game was rescheduled for a twinight doubleheader on Sunday.
"It's not the end of the world," he said. "It's one game. Who knows, the way the weather works it could be no games."
He was right.
By 4:30 p.m., a steady rain began falling. That forced the tarp onto the field and moved batting practice to the indoor cages.
Grissom was all set to get back into the lineup after missing two weeks because of a bruised right knee. His time on the disabled list was up on Thursday -- or so he thought.
Instead of bringing him back then, the Giants decided to wait a day and activate him Friday before consecutive games against left-handed pitching.
But after the Giants' worst losing streak of the season was stretched to seven with a 6-5 defeat in Philadelphia on Thursday night, the news got a little worse. They wouldn't have Grissom on Friday to open a weekend series against Tom Glavine and the Mets.
The rain brightened Grissom's spirit. The Giants wouldn't lose on this day, and Grissom -- 19-for-75 with two homers against Glavine -- wouldn't miss any extra games.
"It's turning around," the outfielder said with a laugh. "That's a start. We have to keep it positive.
"Too bad we got rained out."
Grissom should be in the lineup Saturday when Glavine (3-5) goes to the mound against Giants lefty Noah Lowry (2-5).
"I would've liked to pitch today, but there's nothing you can do," said Glavine, who didn't warm up. "That's the good side of it. I never got going too much on the preparation side."
Even without a game to play, the Giants had a very busy Friday.
First, they traded reliever Matt Herges to the Arizona Diamondbacks for minor-league outfielder Doug DeVore. The popular right-hander was designated for assignment last Sunday, a day after San Francisco acquired reliever LaTroy Hawkins in a trade with the Chicago Cubs.
The deal worked out well for the right-hander, who lives in Arizona.
"It's a plus trade," Colletti said. "Putting Matt in a place that he probably would've wanted to go is a positive."
Colletti said three other teams expressed interest in Herges, but the Diamondbacks stepped up their pursuit in recent days.
The Giants activated right-hander Al Levine from the DL. He had been pitching at Triple-A Fresno on a rehabilitation assignment while recovering from a right neck strain that sidelined him since May 11.
DeVore, who will report to Fresno, hit .289 with seven home runs and 32 RBI this season for Triple-A Tucson. He made his big-league debut last year and hit .224 with three homers and 13 RBI for Arizona.
"He's got power and he's got a chance to play in the big leagues," Colletti said.
All those moves preceded a team meeting with manager Felipe Alou as the Giants keep looking for ways to snap out of their funk.
They have been victimized by poor pitching, sloppy defense, a lack of timely hitting and some bad breaks.
"It's not making excuses or feeling sorry for yourself," first baseman J.T. Snow said. "It's knowing some of those games could've gone the other way.
"And then we're not sitting here talking about seven losses in a row."