That was an unusual first set. Carreno Busta has gone about his tennis in the relentlessly solid way you expect, he’s very focused, a good mover and has asked a lot of questions.
He’s been solid on first serve and his unforced error count is low, he’s just there right at the level.
Zverev’s legs look a bit heavy, he came into the net early on trying to be aggressive but that didn’t work for him and now he doesn’t look like he knows what to do.
He’s got to get the balance right to get Carreno Busta off the baseline and try to dictate as much as possible.