SEATTLE — Randy Arozarena belted an eighth-inning grand slam and then drove in the winning run in the bottom of the ninth inning with a bases-loaded walk, sending the Mariners to an improbable 7-6 victory over the rival Houston Astros on Wednesday afternoon at T-Mobile Park.

The Mariners trailed 5-0 with two outs in the bottom of the ninth and appeared headed for their third straight series loss when Arozarena turned on an inside fastball from Astros lefty Steven Okert, sending it 384 feet into the Houston bullpen beyond the wall in left field.

That got the Mariners within a run at 5-4.

Trailing 6-4 entering the bottom of the ninth, Donovan Solano and Miles Mastrobuoni delivered key singles, and J.P. Crawford reached on a fielder’s choice after an overturned play at third base allowed Solano to stay at third.

That brought up Julio Rodriguez, who snapped a 1-for-22 drought when he sent a sharp double to right field on a two-strike, 99-mph fastball from Bryan Abreu.

Two batters later, Arozarena took a 3-2 fastball well out of the zone for ball four, bringing Rodriguez home for the winning run.

It’s the Mariners’ first series win of the season.

One night after a demoralizing 2-1 loss in 12 innings, the Mariners rallied from a 5-0 eighth-inning deficit to improve to 5-8.

With an off-day Thursday, the Mariners host the first-place Texas Rangers starting Friday for a weekend series.

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