With Ben Rothenberg, we preview the men's Australian Open semifinals between Novak Djokovic versus Tommy Paul and Stefanos Tsitsipas versus Karen Khachanov.Novak Djokovic vs Tommy Paul0:33: Ben Shelton’s run to the quarters.4:22: Where US men’s tennis is at.8:05: Tommy Paul’s run to the semis.9:29: Touching on Ben’s supposed grudge towards Novak Djokovic.12:15 Can Paul trouble Djokovic in this form?Stefanos Tsitsipas vs Karen Khachanov13:36: Stefanos Tsitsipas’s mental game.16:17: How will Tsitsipas fare against Khachanov?17:04: Where does Tsitsipas rank beside Medvedev and Zverev?20:39: Prediction for the tournament.