Friday's US Open semifinal pits Alexander Zverev against Karen Khachanov on hard. Alexander Zverev brings a 4-match winning streak into this one, 7-3 across the last ten. Karen Khachanov brings a 4-match winning streak into this one, 6-4 across the last ten.
There's a wide gap in our ratings on hard, and our number follows from it. If Zverev plays anywhere close to a normal level, this ends in relatively comfortable fashion.