0.90 ERA over his first seven starts and the Dodgers won five of the seven.

But Yamamoto was unable to maintain his Cy Young pace. Over his eight starts before Wednesday, his ERA was 4.43.

Coors Field is a great place for slumping hitters to get right. Pitchers? Not so much.

But Yamamoto rediscovered his Cy Young standard against the Rockies. He retired the first eight batters he faced, four on strikeouts, and 11 of the first 12. He walked a batter in the fifth but got a ground ball double play, facing just 16 batters in the five scoreless innings he pitched before the rain arrived.

Some pitchers will de-emphasize their breaking pitches at Coors Field because of the effects of the altitude. (Justin Wrobleski threw just three curveballs in 86 pitches Tuesday, for example.) But Yamamoto threw 13 curveballs in his 56 pitches, using it more than his four-seam fastball (11). He got four swings-and-misses, four called strikes and a foul ball. The Rockies never put one of his curveballs in play.

A relief relay of Lou Trivino, Alex Vesia, Michael Kopech and Will Klein took over after play resumed and held the Rockies to one unearned run over the last four innings.

Their job was made easier by Muncy’s grand slam — his second in the past three games during which he has three home runs and 13 RBIs. Michael Conforto added a solo home run in the eighth inning, his second home run in two days at Coors Field.