San Diego ? Everybody was awestruck with Barry Bonds’ grand slam off Qualcomm Stadium’s big scoreboard, except the slugger himself.

Bonds’ homer, estimated at 482 feet, gave him sole possession of fourth place on the career home run list with 587 and led San Francisco to a 12-2 win over staggering San Diego on Wednesday.

San Francisco's Barry Bonds points to the sky as he crosses home plate. He hit a grand slam his 20th home run of the season and the 587th of his career in the Giants' 12-2 rout of San Diego on Wednesday in San Diego. Bonds' homer moved him into fourth place on the all-time list, passing Frank Robinson. Teammates Tom Goodwin, Rich Aurilia, left, and Ryan Jensen wait to greet Bonds.

The high-arching homer in the third inning hit the bottom left side of the scoreboard 29 rows beyond the right field wall.

Manager Dusty Baker called it both “monumental” and “a monster.” Hitting coach Gene Clines compared it with some of the eye-popping shots he saw teammate Willie Stargell hit with the Pittsburgh Pirates.

Bonds’ reaction?

“It just has to go over the fence. That’s all that matters,” Bonds said.

It went over the fence, all right. With the exception of Clines, nobody in the Giants’ clubhouse could recall ever seeing a longer homer.

“He killed that ball,” Clines said, who scoffed at the estimate of 482 feet.

“It seems like it was 501,” outfielder Reggie Sanders said. “That was an incredible shot.”

In the 15 seasons that homers have been measured here, only Mark McGwire has hit one farther, a 490-foot line drive into the second deck in left-center on July 20, 1998. That homer was announced then as 458 feet but has been revised. The seat that McGwire’s homer hit is painted white with a red circle in the middle.

Bonds’ 11th career slam gave the Giants a 4-1 lead. It was his 20th homer of the season, tying him with Chicago’s Sammy Sosa for the big league lead.

“It was a big day, especially to do it on a grand slam, that’s pretty awesome, especially that monumental of a home run,” Baker said.

Tankersley (1-2) allowed a double to Giants pitcher Ryan Jensen with two outs in the third, walked Tom Goodwin and hit Rich Aurilia to bring up Bonds.

“I think I watched it longer than Barry did,” Jensen said.

“I don’t know if I’ve seen a longer home run in all the games I’ve seen,” Padres manager Bruce Bochy said. “What’s unfortunate is how he even got up there two outs, nobody on with the pitcher up.”

Cubs 5, Brewers 1, 10 innings

Milwaukee Moises Alou doubled home the tying run with two outs in the ninth inning, and Bill Mueller hit a two-run double in the top of the 10th as Chicago avoided a three-game sweep.

Right fielder Jeffrey Hammonds robbed Sammy Sosa of his 21st home run and hit a sacrifice fly for Milwaukee’s only run.

The Cubs were down to their last out before Alou tied it at 1 with an RBI double off closer Mike DeJean (0-3).

In the 10th, Mark Bellhorn led off with a single against DeJean (0-3), and pinch-hitter Bobby Hill walked. Chris Stynes sacrificed both runners over, and Mueller bounced a ball over the wall in right-center to score both runners. Fred McGriff followed with a run-scoring single, and Alou added a sacrifice fly. Kyle Farnsworth (1-0) pitched two perfect innings for the victory.

Ruben Quevedo put the Brewers in position to win, allowing three hits and striking out 11 over eight innings. But relievers Ray King and DeJean could not hold the 1-0 lead.

Braves 6, Mets 4

Atlanta Henry Blanco hit a two-out, two-run homer off Scott Strickland (5-3) in the eighth inning, and streaking Atlanta extended its lead in the NL East. The Mets lost their fourth in a row and dropped into third place, a half-game behind Florida and 3 1/2 behind the Braves. Chris Hammond (3-2) got out of a bases-loaded jam in the ninth, and John Smoltz got his 16th save. Atlanta starter Greg Maddux, going for his fifth win in a row, gave up three runs in six innings.

Rockies 8, Dodgers 6

Denver Benny Agbayani came off the disabled list and hit a grand slam, and Jason Jennings (7-2) won his sixth straight decision as Colorado won for just the second time in nine games against Los Angeles this season. Los Angeles had its four-game winning streak end and lost for just the fourth time in 14 games. Todd Helton hit a two-run homer and added a run-scoring double in the seventh to put Colorado up 7-3. Jose Jimenez worked two innings for his 16th save. Omar Daal (4-2) took the loss.

Marlins 2, Phillies 1

Philadelphia Luis Castillo went 4-for-5 with a home run to extend his hitting streak to a team-record 23 games, and A.J. Burnett (6-5) pitched a six-hitter for his fourth career complete game. Castillo snapped a 1-all tie in the fifth inning with his second homer of the year. He also singled in the first, seventh and ninth, and his hitting streak is the longest in the majors this season. Mike Redmond had an RBI single in the second inning for Florida. Phillies starter Randy Wolf (3-4) allowed two runs and nine hits through eight innings.

Expos 3, Pirates 1

Montreal Javier Vazquez pitched a three-hitter and struck out 10, leading Montreal over Pittsburgh. Vazquez (4-2) retired 20 of the first 21 batters, allowing only pitcher Josh Fogg’s two-out single in the third inning. The Pirates broke up Vazquez’s shutout bid in the seventh on Brian Giles’ two-out single and Craig Wilson’s double. Vazquez tied his career high for strikeouts. He pitched his second complete game of the season and 12th lifetime.