I don't see Myers doing all that well tbh, I think Duvall takes that matchup. I hope I'm wrong, right handed hitters seems to have the clear advantage thus far, although that view is biased by Trumbo and Stanton being tanks.
Happ was at 109 and had been having a pretty stressful inning with lots of max effort pitches. With no lefty in the lineup, this was a good move by Gibby.