Barry Bonds earned another positive progress report, although no date was set for his return. Trying to elude the disabled list, Bonds worked for three hours at Pacific Bell Park with San Francisco Giants strength and conditioning trainer Dave Groeschner. Bonds' workout included swimming, an exercise that put minimal strain on his ailing back. He might resume light baseball work, such as easy throwing, this week. Bonds suffered a sprained facet joint against the Colorado Rockies and could hardly move for most of that night. He felt so much better within 48 hours, however, that the Giants scrapped his scheduled MRI exams and X-rays. Though encouraged by the leftfielder's progress, trainer Stan Conte withheld celebration. 'People with back problems have good days and bad days,' Conte said. 'People will say, 'Oh, it's gone,' and wake up the next morning and the pain is back. So I reserve the right to change my mind if there is some kind of setback.' Bonds will miss the Giants' three-game series against the Braves in Atlanta that begins this morning (HK time). He said on Sunday that he hoped to play in Milwaukee on Friday. But because his back might stiffen in the course of a long plane flight, he might instead wait for the Giants to return home on May 23. Bonds, who has won three MVP awards and is the only player in Major League history with 400 homers and 400 stolen bases, leads the NL with 15 home runs so far this season. The outfielder missed 47 games last season while he was recovering from elbow surgery. Until Bonds can return to leftfield, Dusty Baker will rotate outfielders Terrell Lowery, Armando Rios and Calvin Murray. He is hoping for success similar to last year, when the Giants went 25-22 without Bonds.