SEATTLE — The Padres scored a first-round knockdown. Then the Mariners had them reeling.

Two teams battling for playoff positioning in their respective leagues ended up going the distance Tuesday night.

The Padres punched back after being staggered and held on to beat the Mariners for the first time in five games this season.

“That was a heavyweight battle right there,” Padres manager Mike Shildt said. “Two really good teams going at each other, playing just good, hard baseball.”

There was a little bit of everything in the Padres’ 7-6 victory. A little too much of some of it.

The Padres followed a five-run first inning, in which Ramón Laureano hit a grand slam, by getting two hits over the next four innings. The Mariners went ahead with a pair of three-run homers in the fifth. The Pad

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