A’s prevail 7-5 in 13

SEATTLE — One more day, Mariners fans. Just one more day, and then it all ends. Then you have months to recover from the sting of a disappointing season that included, well, too many losses like Saturday night.

The Mariners were positioned for a nice comeback victory after overcoming a four-run deficit against the Oakland Athletics before it slipped away in a 7-5 loss in 13 innings at Safeco Field.

Marcus Semien’s two-run homer against JC Ramirez, the eighth Mariners pitcher, provided the winning margin.

That was after Tom Wilhelmsen couldn’t protect a one-run lead in the ninth inning.

Sigh.

It was the Mariners’ 27th loss this season when their opponents scored the winning run in the last at-bat. That’s a lot of heartbreak.

Stephen Vogt started the winning rally against Ramirez with a leadoff single. Semien then sent a high drive to left for his 15th homer.

Switch-pitcher Pat Venditte (2-2) worked three innings and got the win when Felix Doubront worked a scoreless 13th inning and sent Seattle to its ninth loss in 10 games.

The season ends Sunday. Thereafter, attention turns to new general manager Jerry Dipoto and his off-season work on a club that enters the finale at 75-86 after last season’s feel-good 87-75 effort.

The Athletics jumped to a 4-0 lead against Roenis Elias, who exited with no outs and the bases loaded in the third inning. Thereafter, the Mariners’ inconsistent bullpen put together six scoreless innings.

They needed one more.

Wilhelmsen blew a save by squandering a 5-4 lead in the ninth inning — and he had only himself to blame. He started the inning by walking Billy Burns and then hit Mark Canha on a 0-2 pitch.

A wild pitch moved the runners to second and third before Brett Lawrie tied the game on a sacrifice fly to deep left. Canha went to third on Danny Valencia’s grounder to short.

But Wilhelmsen held the tie by retiring Billy Butler on a fly to right.