CHICAGO – Anthony Rizzo hit his first homer with the Cubs, a two-run go-ahead shot in the fifth inning, and the Cubs beat the Houston Astros 3-2 Saturday for their fourth win in five games.

Matt Garza (4-6) struggled but got the victory by working 5 1/3 innings. Five Cubs relievers combined to allow one hit and no runs over the final 3 2/3 innings with Carlos Marmol pitching the ninth for his seventh save in nine chances.

Astros lefty J.A. Happ (6-8) allowed five hits, four walks and three runs in six innings. But the former Northwestern University hurler is winless in his past 11 road decisions dating to May 3, 2011.