BOISE, Idaho, April 4 (UPI) -- American John Isner will go against world No. 1 Novak Djokovic in the first match of the United States' Davis Cup quarterfinal series versus Serbia in Idaho.
Djokovic is 20-7 all-time in Davis Cup play and was seen as a driving force that boosted Serbia to the 2010 Davis Cup title. That was also the start of the charge Djokovic made to become the No. 1-ranked player in the world.