Athletics 3, Orioles 0

-- Marco Scutaro hit a three-run homer with two outs in the bottom of the ninth inning, lifting the Oakland Athletics to a 3-0 victory over the Baltimore Orioles on Wednesday night.

B.J. Ryan (3-4) struck out the first two batters he faced before Damian Miller singled and Bobby Crosby, hitless in 21 career at-bats against the Orioles, walked on a full count. Scutaro then drilled a 2-1 delivery over the left field fence for his fifth homer.

Octavio Dotel (3-1) pitched a scoreless ninth for the victory, the A's third straight while sending the Orioles to their season-high ninth loss in a row.

A's starter Rich Harden threw eight scoreless innings, allowing four hits with a walk and five strikeouts.

Bruce Chen, in his first big league start since last year, made his Orioles debut a memorable one. He took a no-hitter into the sixth inning before Eric Chavez broke it up with two outs on a single to shallow center.

Chen threw seven scoreless innings, allowing three hits with four walks and three strikeouts.

He was 0-1 with a 5.11 ERA in five games with Boston last year, and started the season in the Toronto Blue Jays organization. Baltimore obtained him in a trade on May 2 and he started 17 games -- and relieved in five others -- with Class AAA Ottawa before his contract was purchased before the game.

Chen set down 17 of the first 20 batters he faced before Chavez's single. He walked Miller and Mark Kotsay in the third, but struck out Eric Byrnes to end the inning.

Scott Hatteberg singled and Erubiel Durazo walked to open the seventh. Chen got Miller to fly out to short left and caught Crosby's infield popup. Scutaro beat out an infield single to deep short to load the bases. Kotsay drilled a 3-1 pitch that Jay Gibbons tracked down near the right field foul pole to preserve the shutout.

Harden was just as tough against the Orioles, allowing one base runner -- leadoff hitter Brian Roberts -- to reach second base. He retired 17 of the last 19 hitters he faced.

B.J. Ryan walks off after giving up a three-run home run to A's Marco Scutaro, which ruined the debut of pitcher Bruce Chen and handed the Orioles a ninth straight defeat.