OAKLAND, Calif. (AP) - Scott Sizemore saved Oakland from another disappointing loss. He also saved himself some frustration.

Sizemore singled with two outs in the bottom of the 10th inning, lifting the Athletics to a 4-3 victory over the Angels in the nightcap of the first scheduled doubleheader in the major leagues in eight years.

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``It always feels good to come through in the clutch,' Sizemore said. ``I've been struggling at the plate and just doing anything to get on. The bunt was the solution. Any time you get a hit you start to feel a little more confident and I took that into the last at bat and came through.'

Trevor Cahill lost his third straight decision and the Angels beat the Athletics 4-2 in the first game.

This was the first planned doubleheader in the big leagues since Aug. 2, 2003, when San Diego played at Philadelphia. Since then, twinbills have only been part of makeup games. And it was Oakland's first scheduled doubleheader at home since Aug. 10, 1997, against Milwaukee.

Sizemore hit a 2-2 pitch from Rich Thompson (1-3) to score pinch-runner Cliff Pennington from second.

``I just battled until I got a pitch I could handle, put a good swing on it and found a hole,' Sizemore said. ``Any win is a good win, especially starting the second half. We need to build momentum.'

Brad Ziegler (3-1) pitched a scoreless inning.

Mark Trumbo homered and drove in two runs and Vernon Wells also connected for the Angels.

Cahill (8-8) lasted seven innings in his first outing since the All-Star game, allowing three runs on five hits. He walked five, including three in the first, and struck out eight.

``Not being around the field for a while, it was kind of an awkward feeling,' Cahill said. ``It took a while to get back into things. Maybe that's why I was so erratic in the first inning.'

Jered Weaver (12-4), the AL starter in the All-Star game, did not give up a hit in the first game until the fifth inning. He allowed two runs and seven hits in 6 2-3 innings.

Weaver issued a leadoff walk in the first and then retired 13 straight batters. He struck out three and walked two.

``He was very good,' A's manager Bob Melvin said. ``He's really unpredictable and kept us off balance.'

Jemile Weeks had three hits and drove in a run for the A's. Kurt Suzuki hit a sacrifice fly.

The umpires reviewed a long drive by Hideki Matsui in the A's eighth and determined it was a double as originally called. He needs one homer to become the 34th player (U.S. and Japan combined) to reach 500. He has 332 in Japan and 167 in the U.S.

Weaver escaped trouble in the fifth when left fielder Vernon Wells threw to Erick Aybar, and the shortstop made a relay home that caught David DeJesus trying to score.

``That was the only opportunity we had at the time,' Melvin said. ``We had a chance to score a run there. I'm fine with that.'

The A's chased Weaver in the seventh. DeJesus doubled, Conor Jackson singled and Suzuki had a sacrifice fly. Cliff Pennington and Weeks followed with singles, ending Weaver's afternoon.

Scott Downs got Crisp to ground out, ending the threat.

Cahill lost to the Angels at home for the first time in five starts despite receiving run support for the first time in four starts.

``The first couple of innings it didn't look like his command was there,' Melvin said. ``But as good pitchers do, he regrouped, came back and shut them down.'

NOTES: A's RHP Guillermo Moscoso was announced as Tuesday's starter in Detroit. The A's will make a corresponding move before that game. ... Weaver's major league-leading 1.86 ERA entering play was the lowest after 19 starts in Angels' history. ...Angels RHP Fernando Rodney (upper back strain) was scheduled to start a minor league rehab assignment with Class-A Inland Empire in nearby San Jose on Saturday. ... Walden needs one save to match the Angels rookie record established by Ken Tatum in 1969. ... The A's have been swept in each of their past four doubleheaders. ... The A's and Angels last played a doubleheader on July 30, 1983. ... The A's recalled LHP Jerry Blevins from Sacramento (PCL) and optioned IF Adam Rosales to Sacramento between games.