Christian Walker launched two homers, including the decisive eighth-inning blast off Peralta, to lift the Astros to a 4-3 win over Colorado and cap a two-game cushion atop the AL West. Houston’s bullpen slammed the door for the final 10 outs as Altuve and Peña contributed early, Alvarez remained out but could be a pinch-hit option, and Walker continued a strong second-half surge with nine homers in 37 games. Colorado staged a late-inning rally but couldn’t finish, dropping into a tie with a sputtering offense.