Watching this match, this is where Shapo might have a problem playing with Zverev. Usually when a lefty faces a righty, it will be the forehand vs backhand battle. And most of the time the left will win that battle unless the righty has a GREAT backhand (Djokovic, Murray and etc...), in this particular case, Zverev is comfortable on trading those type rallies with Shapo. The question for Shapo is he willing to do a backhand to forehand exchange with Zverev?
In addition, if Zverev is serving well, can Shapo return well enough to make Zverev nervous?