In his drive through a rookie season with twists, Antonio Senzatela continues trying to maximize time. The 22-year-old right-hander from Venezuela, in and out of an evolving Rockies rotation, will return to a starting spot Wednesday at Kansas City, manager Bud Black said Saturday. So good through April, with a 2.81 ERA through five starts, Senzatela wavered through June as his arm tired and batters picked up on his fastball-heavy pitch mix.