SEATTLE — Leo Rivas led off the bottom of the 13th inning with a two-run homer and the Seattle Mariners outlasted the St. Louis Cardinals 4-2 on Wednesday night for their fifth consecutive victory.

Seattle completed a three-game sweep and remained one game behind Houston atop the AL West. The Mariners lead Texas by 1 1/2 games for the final American League wild card.

Thomas Saggese had four hits for the Cardinals, including an RBI single that gave them a 2-1 advantage in the 11th, but Jorge Polanco tied it with a run-scoring double leading off the bottom half.

Rivas entered as a pinch runner for Polanco and advanced to third base before getting thrown out at the plate on a grounder as Seattle squandered an excellent chance to win.

But in the 13th, Rivas turned on a first-pitch slider f

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