Tennis: Davis Cup result: USA 0 Serbia 1

Results from the first day of the Davis Cup World Group quarter-final tie between the United States and Serbia on Friday:

USA 0 Serbia 1

Novak Djokovic (SRB) bt John Isner (USA) 7-6 (7/5), 6-2, 7-5

Playing later

Sam Querrey (USA) v Viktor Troicki (SRB)

Saturday

Bob Bryan/Mike Bryan (USA) v Nenad Zimonjic/Ilija Bozoljac (SRB)

Sunday

Sam Querrey (USA) v Novak Djokovic (SRB)

John Isner (USA) v Viktor Troicki (SRB)