LF Yoenis Cespedes hit two home runs and drove in a career-high tying five runs Wednesday night in a 9-7 victory against Houston, but he sprained his right thumb in his third at-bat and left the game after six innings. A's manager Bob Melvin said X-rays were negative, but he doesn't know if Cespedes will be able to play Thursday afternoon in the series finale. Cespedes was jammed on a pitch from RHP Jake Buchanan in the third inning and fell awkwardly after hitting a soft ground ball to second base. He stayed in the game but was replaced at the end of the sixth inning.

INF Alberto Callaspo (strained right hamstring) could begin a rehab assignment as early as Sunday, A's manager Bob Melvin said. "He's taken full BPs, he's taken ground balls, he feels good," Melvin said Wednesday. "He'll probably do a couple more days of this, and there's a chance he'll be ready by Sunday." Callaspo landed on the 15-day disabled list July 12.

RHP Jim Johnson had another nightmare appearance out of the bullpen Wednesday in Oakland's 9-7 victory against Houston. Johnson gave four hits and four runs (three earned) and didn't retire a batter in the eighth inning when Houston scored five runs and cut Oakland's lead to 9-7. He left the game once again to a loud chorus of boos from A's fans. His ERA is 6.92. "It was 9-2, we had a long game (Tuesday) night," A's manager Bob Melvin said. "He was one guy that didn't pitch, so therefore he was in the game. At the time we were hoping to maybe use him for two (innings), but it didn't happen. So it is what it is. He's having a tough time."

SS Jed Lowrie hit his fifth home run of the season Wednesday night in a 9-7 victory against Houston, his former team. Lowrie hit a leadoff home run off former A's minor-leaguer Brad Peacock in the second inning, giving Oakland a 1-0 lead and igniting a five-run rally. Lowrie launched Peacock's first-pitch fastball down the right field line and into the stands. Houston traded Lowrie to the A's, along with RHP Fernando Rodriguez, after the 2012 season for Peacock, 1B Chris Carter and minor league C Max Stassi.

RHP Jesse Chavez (8-6) gave up two runs on four hits over 5 2/3 innings Wednesday night in a 9-7 victory against Houston. Pitching on 10 days' rest, Chavez struck out seven and walked two. "He was rejuvenated," A's manager Bob Melvin said. "The cutter had some teeth on it tonight."

C John Jaso went 3-for-3 with a double, a walk and two RBIs on Wednesday night in Oakland's 9-7 victory against Houston. Jaso, who also scored a run, is batting .441 (15-for-34) over his past 10 games. He tied his season high for hits in a game.

1B Kyle Blanks (torn left calf) is "starting to turn a corner" in his recovery and is getting closer to being ready for a rehab assignment, A's manager Bob Melvin said Wednesday. "Yesterday he looked a lot better. Still not running full speed yet, but moving around a lot better," Melvin said.