Jerry Blevins surrendered an RBI single to Matt Holliday, then Adams' first-pitch homer that broke open the game.
Holliday faced repeated boos while in left field and at the plate from his former fans. He briefly played for the A's in 2009, all of 93 games.
NOTES: The Cardinals are sticking with rookie Shelby Miller on schedule despite his struggles. "He's going to go back out there and do what he was doing," Matheny said. ... A's C John Jaso missed his seventh straight start with a cut on his left hand. ... A's C Stephen Vogt received 100-plus text messages in addition to greetings on Facebook and Twitter after his first major league hit -- and home run -- Friday night ended an 0-for-33 start. "It's really neat to get everybody's support," he said. ... Umpires received water between innings. ... Wainwright is 8-5 in interleague play. ... LHP Tommy Milone looks to snap a four-start winless stretch with his first win since June 3 in Sunday's finale against St. Louis RHP Jake Westbrook.