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Houston, TX (Sports Network) - Nick Franklin punctuated a seven-run second inning with his first career grand slam, spotting Seattle ace Felix Hernandez an early sizeable lead that wound up becoming a 12-5 rout of the Houston Astros at Minute Maid Park.

Dustin Ackley, Michael Saunders and Brad Miller each had two RBI for the Mariners, who swept this three-game set while extending their season-high winning streak to six games.

Hernandez (11-4) lowered his American League-best ERA to 2.43 after scattering four hits -- all singles -- and striking out seven over six innings.

Houston starter Jordan Lyles (4-4) was tagged for 10 runs -- nine earned -- on eight hits and two walks in four-plus innings.