It was the Rockies on the road, but Imanaga looked great obviously. That split was nasty, tons of whiffs. Rockies weren't as fooled on it 3rd time through the order though, will be interesting to see how he does 2nd time through the league.
He seems pretty good at keeping the FB in the strikezone, even when he misses his spot. Low BB/9 should help him even if he does give up HR.