Raonic won the first set after breaking Troicki's serve in the eighth game and then held his own serve.
The 21-year-old broke Troicki's serve in the third game of the second set and then held his serve, finishing it off with an ace, to go ahead 3-1 in the set.
Raonic overcame a couple of double-faults in the sixth game of the second set to go ahead 4-2, again finishing it with an ace, his fourth of the 1-hour, 8-minute match.
In other matches, Radek Stepanek of the Czech Republic upset Alexandr Dolgopolov of Ukraine 6-3, 6-1 ; former world No. 2 Tommy Haas of Germany stopped David Nalbandian of Argentina 6-2, 6-7 (11), 6-3; Mikhail Youzhny of Russia held off Kevin Anderson of South Africa 6-1, 7-6 (3); and Juan Monaco of Argentina outlasted Vasek Pospisil of Canada 7-5, 6-4.
- Viktor Troicki
- Milos Raonic
- Sam Querrey
- Jurgen Melzer
- Matthew Ebden