Watch Jack Sock kick off the USA v Australia quarterfinal tie at Davis Cup by BNP Paribas tonight on Tennis Channel starting at 10PM ET. Followed by John Isner v Nick Kyrgios in the second rubber. 🇺🇸 v 🇦🇺 on 📺

BRISBANE, Australia -- American Jack Sock and Australian Jordan Thompson will kick off the U.S. v Australia quarterfinal tie on Friday (Thursday 10 PM ET in U.S.) in Brisbane, Australia.Ranked world No. 15, Sock will aim to lead U.S. to the semifinals in h