The Seattle Mariners signed veteran Henry Blanco on Friday and designated fellow catcher Kelly Shoppach for assignment. The Mariners didn't sign Henry Blanco for his bat. Blanco even played a part in keeping the A's off the board when he tagged out Oakland's Jed Lowrie at the plate to save a vital run a momentum changing play that prompted an impassioned fist pump from Hernandez, a teammate of Blanco's from Team Venezuela in the World Baseball Classic. Yet it was Blanco, playing in his first game as a Mariner after meeting the team in Oakland one day ago, who shined brightest Saturday in Seattle's 4-0 win against the A's. Seattle's backup catcher broke a scoreless tie in the sixth inning with a grand slam that was more than enough for Felix Hernandez to improve to 8-4 after dealing his fourth scoreless outing of the season. He later jogged to the mound and put his arm around Hernandez's waist to say a few words to his two-day old teammate with runners on first and second and no outs in the seventh and Josh Donaldson at the plate.