New Seattle Mariners hitting coach Kevin Seitzer explains how he and Edgar Martinez plan to help Julio Rodríguez maximize his superstar potential.

Julio Rodriguez supplied the big highlight during Wednesday's Cactus League game, launching a missile of a grand slam.

Seattle Mariners center fielder Julio Rodriguez had a great tribute to Ichiro ... a 10-time All-Star and Gold Glove Award winner, was a nearly unanimous Hall of Fame selection last month.

The Mariners lost to the Royals 9-6 in spring training action Wednesday, but not before Julio Rodriguez blasted his first two ...