SAN FRANCISCO (AP) _ While the season opened in Puerto Rico, the Giants and the Athletics were still tuning up by San Francisco Bay.

NL MVP Jeff Kent hit a go-ahead single in the fifth inning to score Barry Bonds as the Giants beat the A's 6-3 in the conclusion of the two-game Bay Bridge Series between division champions.

Bonds had tied it with an RBI double that bounced off the right-field wall.

Jose Ortiz's RBI grounder scored Johnny Damon in the first inning, and Adam Piatt added an RBI single in the second to put the A's up 2-0.

Eric Davis narrowed it for the Giants with a fourth inning single that scored Kent, who tripled.

Ramon Martinez drove in two more runs for the Giants with a sixth inning double, and Juan Melo added an RBI triple in the seventh.

Olmedo Saenz hit a solo home run in the top of the ninth for the A's.

Mark Mulder, who underwent intense physical therapy three days a week in the offseason to treat a back injury, allowed three runs and nine hits in 4 2-3 innings.

Giants starter Shawn Estes allowed two runs and five hits in four innings. Russ Ortiz, who threw two innings in relief of Estes, got the win. Ryan Jensen earned the save.

AL MVP Jason Giambi, who set a deadline of opening day for a contract extension, did not know if his deal would be completed. While the sides have agreed on $90 million over six years, Giambi wants a no-trade clause and Oakland was balking.

Giants shortstop Rich Aurilia was not in the starting lineup, replaced by Martinez. Aurilia was hit on the elbow by a Cory Lidle pitch in the first inning of Saturday's game, and it wasn't clear if he would play in Monday's opener against San Diego.

Livan Hernandez starts for the Giants against Woody Williams.

Tim Hudson, the A's 20-game winner last season, will face Freddy Garcia in Seattle.

Notes: A young girl who announced batting order in the third inning pronounced Russ Davis' name ``Roos.'' For the rest of the game, the crowd chanted ``Roos! Roos!'' whenever he came up to bat. ... The A's end the exhibition season with a 3-2 edge over the Giants. ... The Giants will open at home for just the third time in 13 years.