"Last year I found out three hours before the match that I would play," Troicki said. "But this time, I'm aware that he might not play if he's not right."
Djokovic, Nadal due back on court in Davis Cup →
Sam Querrey, the top-ranked American at No. 20, will face Viktor Troicki in the second match, based on the draw announced Thursday in Boise, Idaho.
Isner to face No. 1 Djokovic in Davis Cup in Boise →