The A's have won games on home runs, singles, walks and even errors, beating some of baseball's best relief pitchers in the process.
Brandon Moss got a face full of pie after a game-winning home run.
After going down early, the A's rallied behind two home runs from Yoenis Cespedes and a solo shot by Josh Reddick. Rosales joined the party in the top of the 10th inning with a drive down the left field line.
With two strikes and two outs, Rosales fisted a high and tight fastball from White Sox fireballer Matt Thornton over the fence.
Rosie was hitting .227 with just four home runs before his go-ahead dinger but is only an honorable mention because his blast didn't end the game.
One of the A's first walk-off wins of the season was pure luck, when a bunt attempt to a steady fielder turned into an RBI for Coco Crisp.
Normally sure-handed third baseman Manny Machado, who beat out Josh Donaldson for the All-Star team, made the risky play to go for lead runner Eric Sogard.
Third base coach Mike Gallego had to scream into Sogard's ear to get him up and running, but there was no stopping Nerd Power with an off-line throw.
Thornton was dealt to the Red Sox after a rough first half with Chicago, but couldn't escape the A's extra-innings heroics.
Donaldson lofted a two-out Texas Leaguer in front of right fielder Daniel Nava, whose throw to the plate was too late to nab Chris Young.
Coco Crisp broke up Boston starting pitcher Brandon Workman's no-hitter in the seventh inning, and Donaldson followed a game-tying home run, foreshadowing what would come in the 11th.
As the old adage goes, "A walk is as good as a hit."
Left-handed reliever Hector Santiago gave up a double to Chris Young, intentionally walked Yoenis Cespedes and uninetentionally walked Josh Donaldson.
Brandon Moss nearly drove in the winning run, but his line drive was snared by second baseman Jeff Keppinger.
With a .170 batting average, Reddick wasn't going to swing on a 3-1 pitch. Santiago made it easy by delivering a free pass, his fifth walk in 1.2 innings.
Like Bruce Springsteen, Jemile Weeks was born to run. His poor hitting and defense earned him a demotion in 2012, but Weeks is back in the bigs because of his wheels.
Weeks pinch ran for Alberto Callaspo after a leadoff single, then hustled over to second on a deep fly ball to left.
With a speedy runner in scoring position, Angels pitcher Michael Kahn intentionally walked Jed Lowrie, then issued another free pass to Coco Crisp.
Donaldson capped the game by driving an 0-2 pitch into right-center, his third hit of the day.
By supplying one run in eight innings against Aaron Harang, the A's were in danger of making Jarrod Parker into the next Tim Hudson. Brandon Moss had other ideas.
Parker put runners on the corners to begin the eighth inning, but retired three consecutive batters to escape the threat. He worked the ninth as well for the first complete game of his career.
The Mariners went with Carter Capps, the de facto closer, after Tom Wilhelmson's meltdown in the bottom of the ninth. Moss popped a 96 mph Capps fastball to dead center for the A's only win of the three-game series.
Nate Freiman normally bats against lefty pitchers, but 18-inning games call for desperate measures. The 6'8" rookie responded with a game-winning single to left off Mariano Rivera.
A's starter Jarrod Parker allowed a two-run shot to Robinson Cano in the first inning, then combined with the bullpen to keep the Yanks scoreless for 17 frames.
Jesse Chavez earned the win with seven strikeouts in 5.2 shutout innings, trimming his ERA from 2.57 to 1.83. Grant Balfour, Jerry Blevins, Ryan Cook, Pat Neshek and Hideki Okajima all kept the Yankees' bats at bay.
Donaldson wasn't recognized as one on the American League's best hitters back in early April. He was just a guy trying to hold onto the third base job.
The 12th-inning dinger extended Oakland's nine-game winning streak after two losses to open the season. Two of Donaldson's three walk-off hits have gone to the opposite field and 50 of his 165 hits have been to the right side.
Oakland scored four runs in the bottom of the eighth before Cespedes tied it up with an RBI single in the ninth. The Angels look poised to win after scoring in the 15th, but Rosales knocked in Derek Norris in the bottom of the frame.
Though Jerry Blevins pitched well and got the win, Brett Anderson was the real hero on the hill. Anderson tossed 5.1 emergency innings out of the bullpen while nursing a sprained ankle, allowing one run on three hits.
The walk-off was Moss' second home run of the game, but his first of the day, as the game ended at 1:41 a.m. He had three hits in eight at bats, completing a 9-for-25 run over six games.