OAKLAND, Calif. -- Mark Kotsay's slump is over.
"I wasn't trying to do too much," Kotsay said. "I just wanted to stay inside the ball. That was a huge at-bat. We haven't scored a lot of runs lately."
Kotsay snapped out of a 1-for-22 slump with six hits in the past two games.
"Kotsay has been unbelievable all year," said A's outfielder Eric Byrnes, who made a diving catch in foul territory to end the fifth. "He's been the one guy who has kept this thing floating when nobody else has been showing up."
"We have the bases loaded in the eighth and ninth innings and only score one run," Seattle manager Mike Hargrove said. "That's a tough way to win a ballgame."
Keiichi Yabu (2-0) pitched a scoreless inning for the win. Kotsay finished 5-for-6 and tied an Oakland record for hits.
"You can't put two guys on like that because it will cost you every time," Villone said. "I started to rush one or two pitches."
Kotsay had three hits off starter Jamie Moyer, raising his career average to .714 (10-for-14) against the left-hander.
On a day he received his best run support of the season, Oakland starter Joe Blanton still wasn't able to get his first major-league win. He departed with two outs in the fifth following a single by Ibanez.
"It was one of those days when I went to the mound without everything," Blanton said. "It was all I could do to get through it."
Blanton, who allowed five earned runs in his previous four starts combined, gave up four runs and eight hits with three walks and three strikeouts.
Moyer failed in his first try to become Seattle's winningest pitcher, lasting a season-low 3 2/3 innings. He gave up season highs for runs (five) and hits (10). He walked two and struck out one.
Randy Johnson and Moyer have each won 130 games with the Mariners. Moyer is four wins shy of 200 for his career.
The 42-year-old Moyer was a senior at Souderton Area High School in Pennsylvania when the 24-year-old Blanton was born in Nashville, Tenn., and had already won more than 100 major-league games by the time Blanton graduated from high school in 1999.
Eric Chavez ended Moyer's day with a double, his 13th RBI against the left-hander, his most against any pitcher.
Erubiel Durazo singled to score another run in the third to make it 4-0.
Seattle cut the lead in half when Ibanez's grounder scored a run and Boone stole home as part of a double steal with Randy Winn.
Sexson hit his sixth home run over the right-field fence in the fifth to close the gap to 5-4.
- Ichiro Suzuki has hit safely in 20 of his 24 games, including a major league-leading 14 multihit games.
- The Mariners (12-12) finished April with their best month since going 13-12 in September 2003.
- C Dan Wilson was the last Seattle player to steal home on Aug. 1, 1999, against Baltimore.
- Chavez's double in the fourth was his 186th, tying him with Jose Canseco for 10th on Oakland's career list.
- Moyer was 0-7 in 13 day starts last year.