FRESNO, California (Ticker) -- Barry Zito tossed six hitless innings and Roberto Vaz belted a grand slam homer as the Sacramento River Cats blanked the Fresno Grizzlies, 6-0. Zito (3-2), who allowed just an unearned run over six innings in his last start, issued four walks and struck out six to earn the win. Reliever Tim Kubinski gave up a single to Travis Young with two outs in the eighth inning to end the no-hit bid. Vaz higlighted a six-run sixth inning with his fourth homer of the season. Mark Bellhorn followed Vaz's grand slam with a solo shot and Danny Ardoin had an RBI double for Sacramento, which has won four games in a row. Mike Riley (1-2) yielded three runs on six hits in 5 1/3 innings to take the loss for Fresno, its fifth straight.