OAKLAND, Calif. -- Baltimore Orioles center fielder Adam Jones knew what to expect in the first inning Saturday night when he came to the plate with two runners on base and faced Oakland A's right-hander Jason Hammel, his teammate the previous two seasons.

"I faced him a couple years back, a few of us, when he was with the Rays," Jones said. "But playing behind him for two years, I think we had a solid scouting report on him and what he's done. That was only last year we had him. It's not like he's a couple years removed. We had a plan just to get some strikes. He fell behind and threw us some good pitches, and we didn't miss 'em."

Jones crushed a 2-0 Hammel pitch over the left-field fence for a three-run homer, shortstop J.J. Hardy launched a solo shot with two outs in the first, and the Orioles rolled to an 8-4 victory against the A's at the O.co Coliseum.

Jones had a career-high-tying five RBIs, helping the Orioles avenge their bitter 5-4 loss Friday night when A's third baseman Josh Donaldson hit a three-run, walk-off homer.

"It's tough, it's frustrating, last night," Jones said. "But we got another day. Live to fight another day. The beauty of baseball."

Jones went 2-for-4, scored twice, walked once and stole his sixth and seventh bases of the season. He had more RBIs in a game since driving in five on July 28, 2008, against the New York Yankees.

"Adam will tell that there were a couple of (RBIs) he left out there, but I'm proud of him," Orioles manager Buck Showalter said. "He's just turned into a real inspirational guy, who not only says the right things but exemplifies them by the way he plays."

Hammel (0-2) lasted just two-plus innings in his first start at the Coliseum since being traded by the Chicago Cubs. Hammel gave up five runs and six hits, including home runs to Jones and Hardy in the first inning.

Hammel fell to 0-5 in his career against Baltimore. He faced the Orioles for the first time since signing with the Cubs as a free agent after last season.

"Physically I felt good," Hammel said. "It was just bad execution. This is one I have to go home and forget. Those guys have a pretty good idea where their strike zone is. I'm just not pitching like myself right now, which is fastball command. You'd like to show them something they're missing. They got the better of me this time."

First baseman Chris Davis hit a solo home run for the Orioles, who took over the major-league lead for homers with 119, two more than Toronto. Davis also doubled and drove in two runs.

Baltimore right fielder Nick Markakis went 4-for-5, tying his season high for hits, scored twice and made a spectacular running catch in the fifth inning, saving a run.

Left fielder Steve Pearce went 3-for-4 with two doubles and scored twice.

Orioles left-hander Wei-Yin Chen (10-3) allowed three runs and five hits with five walks and five strikeouts in five innings. He improved to 4-0 in five career starts against Oakland.

"I wouldn't say I threw great out there, but I think it still was pretty good," Chen said.

A's right fielder Brandon Moss hit a solo home run and shortstop Jed Lowrie went 2-for-4 with a double and three RBIs.

The Orioles increased their lead in the American League East to five games over the Yankees and the Toronto Blue Jays.

The A's had their season-high seven-game home winning streak snapped but remained 1 1/2 games ahead of the Angels in the American League West.

Markakis led off the game with a bloop single to right, Pearce walked and Jones hit his 17th home run of the season.

"His command of the heater wasn't very good and he got into some bad counts and they made him pay," A's manager Bob Melvin said of Hammel.

"The first three guys, I think, got 10 hits. They really have a lineup one through six who can hit a lot of home runs and score a lot of runs. We had a lot of trouble with the top of their lineup."

Hardy hit his fourth home run of the season and third in his past 15 games.

The Orioles increased their lead to 5-0 in the third inning when Jones walked, moved to second on designated hitter Nelson Cruz's single and scored on Davis' double to left center. That was it for Hammel, who was booed as he walked off the mound to the dugout.

NOTES: The A's honored their 1989 World Series championship team in a pregame ceremony Saturday night. Hall of Famers Rickey Henderson, Dennis Eckersley and manager Tony La Russa took part. So did a long list of players, including Jose Canseco, Dave Stewart, Dave Parker, Dave Henderson and Carney Lansford. Canseco, returning to the Coliseum for the first time since his playing career ended in 2001, received one of the loudest ovations. ... Oakland CF Coco Crisp started for the second straight game but served as Oakland's designated hitter as he continues to deal with a sore neck. "It's something he'll have to deal with probably for a little bit here," A's manager Bob Melvin said before the game. ... Orioles DH Nelson Cruz was in the starting lineup, one day after fouling a ball off his left foot in the sixth inning. "Probably going to lose a toenail," Orioles manager Buck Showalter said before the game.