SEATTLE — Ryon Healy bounced a ground-rule RBI double to right-center with two outs in the ninth inning Saturday night to give the Oakland Athletics a 4-3 victory over the Seattle Mariners.
Rajai Davis opened the ninth with a slow-rolling infield single to third off Edwin Diaz (2-4), who relieved to open the inning. Davis stole second as Matt Joyce struck out. Yonder Alonso was walked intentionally with two outs and Healy then ripped an 0-2 pitch into the gap.
Sean Doolittle (1-0) pitched the eighth for the victory. Santiago Casilla finished for his 15th save, despite allowing a two-out double.
Alonso and Marcus Sieman had solo homers for the Athletics off rookie Andrew Moore, who allowed three runs in six innings in his third start.
Oakland’s Chris Smith, called up Saturday, made his first major league start at age 36 after 63 relief appearances. He left after six innings tied 3-3. The right-hander allowed six hits, struck out four and walked one. Smith’s career record remains 1-0 with a victory in relief in 2008 with Boston.
Semien, activated off the disabled list Thursday after missing 74 games, snapped a 2-2 tie in the fifth with his first homer, a one-out solo shot.
Jarrod Dyson knotted it 3-3 when he opened the bottom half with his fifth home run.
Oakland took a 1-0 lead in the second on singles by Healy, Bruce Maxwell and Jaycob Brugman and made it to 2-0 in the third on Alonso’s 20th homer.
Seattle tied it in the bottom half on doubles by Dyson and Jean Segura and Ben Gamel’s RBI single.
Mariners right fielder Mitch Haniger saved at least one run in the fourth with a running grab of Davis’ drive deep into the corner to end the inning with two aboard.
MARINERS: INF Shawn O’Malley (recovering appendix surgery) made his first two rehab appearances in the Arizona rookie league, both times in the leadoff spot as DH. He went 2 for 2 on Friday with a triple, and three walks. O’Malley had one hit in three at-bats Saturday with an RBI.
ATHLETICS: Rookie RHP Daniel Gossett (1-3, 6.23 ERA) closes out the four-game series on Sunday afternoon at Safeco Field. He has walked just three in 26 innings in his five starts since being called up, but has allowed seven homers.
MARINERS: RHP Felix Hernandez (3-3, 5.04 ERA) makes his fourth start since coming off the DL on June 23. The longtime ace, who entered the season with a career 3.16 ERA, is 1-1 with a 5.50 ERA since return after missing almost two months (right shoulder inflammation).