As one rivalry begins, another endures... Joel Drucker talks Nick Kyrgios/Zverev and Roger Federer/Rafa Nadal

Years from now, when their careers are over and they reflect on their many battles, Nick Kyrgios and Alexander Zverev might well recall the first time they met at an ATP World Tour event. It happened Tuesday at the BNP Paribas Open, the third match of the