Hendricks (13-7) allowed three hits and has given up three or fewer runs in 18 straight starts. He didn't allow a hit until Gregory Polanco's bloop to left-center in the fifth and faced the minimum 17 batters until John Jaso's two-out double in the sixth.
Rizzo belted a two-run homer off Chad Kuhl (3-2) in the first and Miguel Montero added an RBI single an inning later as the Cubs improved to 84-47.
Carl Edwards Jr. worked the eighth and Aroldis Chapman finished the four-hitter for his 31st save as the Cubs improved to 21-6 this month, one win shy of the best August in franchise history set in 1932.
