Which is still well short of Isner's level of play, backhand or not. You think Isner is a better matchup for Harrison?
Not taking anything away from Christian. He is very talented and played well today, but anybody with a good serve and backhand can push John to the limit these days.
I think Christian is capable of beating Kuznetsov, but Smyczek is a tough match up b/c he is naturally more aggressive and takes the ball early (kinda similar to Kudla).