Pivetta threw very well until the 6th, where I thought he tired, his velocity didn't dip, but his command went south.
He definitely needs to develop a changeup, third time through the lineup the Astros timed his FB and recognized his curve.
Part of the learning curve for young pitchers, and why he'd been better off spending the year in AAA ball.
Two pitch pitchers won't last as ML starters, you need that third pitch to throw the hitters' timing off.