Astros 2, Angels 0: Chris Carter belted a two-run homer and Bud Norris outdueled Jerome Williams as visiting Houston extended its winning streak to a season-high four games.

Norris (5-4) limited Los Angeles to four hits over six innings, two of which were doubles by Mike Trout. The right-hander walked two and struck out three and improved to 3-0 against the Angels this season.

After six scoreless frames, the Astros finally broke through in the seventh. J.D. Martinez delivered a one-out single - Houston's second hit of the night - and Carter launched his 11th homer two batters later for a 2-0 lead.

Jose Cisnero worked two innings for Houston and Jose Veras allowed two baserunners in the ninth before securing his 10th save in 13 opportunities.

Williams (4-2) was the hard-luck loser after yielding two runs and three hits over seven innings. Erick Aybar also recorded two hits for the Angels, who have lost four of six following an eight-game winning streak.

GAME NOTEBOOK: Houston improved to 4-0 on its six-game road trip. It has won four straight away from home for the first time since a five-game run from May 22-June 2, 2011. ... Norris has allowed a total of two runs in 19 innings over his last three starts. He also has given up just one run in 21 innings against the Angels this season. ... Williams has surrendered two runs or fewer in each of his last five outings.