Yordan Alvarez homered for the first time since returning from a fractured right hand, helping Framber Valdez and the Houston Astros beat the Colorado Rockies 4-0 on Wednesday night.

Alvarez hit a two-run drive off Angel Chivilli in the eighth inning for his fourth homer this season. The slugger was activated from the 60-day injured list Tuesday and went 0 for 2 with two walks in his first game back.

Valdez (12-7) allowed three hits — all singles — in seven innings. The left-hander struck out five and walked two.

Cam Smith also went deep for Houston, which remained 1 1/2 games ahead of Seattle for the top spot in the AL West.

Injury updates

The Houston Astros placed catcher Victor Caratini on the concussion injured list on Wednesday, putting the AL West leaders in a bind behind the plate.

Yainer Diaz, another Houston catcher, is day to day with a left wrist injury. He was hit by an errant pitch from Craig Kimbrel while catching in the eighth inning of Sunday’s 3-2 loss at Baltimore.

The Astros recalled catcher César Salazar from Triple-A Sugar Land, and he got the start for Wednesday night’s game against Colorado.

Caratini took a foul ball off the mask during the ninth inning of Tuesday’s 6-1 loss to the Colorado Rockies. Caratini is batting .262 with a career-high 43 RBIs, while matching his career high with 11 homers in 95 games this season.

Diaz is batting .257 with 18 homers and 55 RBIs in 116 games this season.