Barry Zito blanked the Rockies for seven innings and went 2-for-3 at the plate Wednesday in the Giants' 10-0 win. Javier Lopez and Chad Gaudin finished the shutout. After two starts, Zito has allowed no runs and scored twice. It's anyone's guess how long it will last -- Zito has enjoyed very good Aprils before -- but after last year's postseason, it's getting tougher and tougher to doubt him.