OAKLAND — And the Mariners keep coming.

Ketel Marte delivered a tie-breaking RBI single Sunday in the ninth inning that enabled the Mariners to stretch their winning streak to five games with a 3-2 victory over the Oakland Athletics.

“We had a lot of clutch hits late and needed it,” manager Scott Servais said. “The bullpen was solid. Nice series for us. We certainly got accomplished what we needed to get done here.”

The victory allowed the Mariners to remain 3 1/2 games behind Baltimore in the race for the American League’s final wild-card berth with 19 games remaining.

So it remains an uphill battle.

“You’ve got to take it just one game at a time,” said third baseman Kyle Seager, who started a key double play in the Oakland eighth inning. “You’ve got to be in the moment. You’ve got to have fun.”

“Today was a battle, but we got some big hits.”

Mike Zunino had two of them.

His two-run homer in the second inning opened the scoring and was all the Mariners had until the ninth, which he started by whacking Ryan Madsen’s first pitch into the left-field corner for a leadoff double.

“When you get the closer in there,” Zunino said, “you want to hop on him early. Not try to wait him out. We had a decent report on him, which said the first pitch is usually the best pitch to get. I didn’t want to waste any time.”

After Ben Gamel replaced Zunino as a pinch-runner in the ninth, Leonys Martin fouled off an attempted sacrifice bunt before lining a single to right. Third-base coach Manny Acta chose caution and held Gamel at third.

It didn’t matter.

Marte punched an RBI single up the middle.

“I was thinking (Madsen) would throw me a fastball on the first pitch,” he said, “and when he threw me a fastball, I put my best swing on it.”

The Mariners had a chance to add to extend their lead, but one run was enough for rookie closer Edwin Diaz, who closed out the victory for his 15th save in 16 chances.

It was tense throughout the closing innings.

Former Oakland reliever Evan Scribner inherited a 2-2 tie when he replaced Mariners lefty James Paxton to start the seventh inning. Paxton limited the Athletics to two runs and five hits in six innings.

Scribner yielded a one-out triple to Brett Eibner but escaped when, after an intentional walk to Yonder Alonso, pinch-hitter Joey Wendle grounded into a double play.

Seager opted to try for two outs after gloving a sharp grounder. Marte scampered over from shortstop for the catch and made a snap throw to first for the double play.

“(Wendle) runs pretty well,” Seager said, “but as hard as that ball was hit, as soon as I got to it, I was going to second. Marte made a nice turn, coming from shortstop. That play is a little harder from there.”

Steve Cishek then pitched around Jake Smolinski’s leadoff single in the Oakland eighth inning. Cishek (3-6) got the victory when the Mariners scored in the ninth. Madsen (5-5) was the loser.

Athletics right-hander Raul Alcantara, in his second career start, gave up a two-run homer in the second inning to Zunino but nothing more before departing with two outs and runners at second and third in the sixth inning.

Adam Lind preceded Zunino’s homer by working back from an 0-2 hole for a two-out walk. Alcantara then jumped ahead 0-2 on Zunino, missed with a slider and then tried another one.