Top seed and world No. 1 Roger Federer faced a tough test in his first-ever appearance at the AIG Japan Open on Wednesday before dispatching qualifier Viktor Troicki 7-6 (7-2), 7-6 (7-3) at a packed Ariake Colosseum.

News photo Andy Murray returns the ball during his 3-6, 6-7 (1-7) loss to Jiri Novak on Wednesday in the Japan Open. AP PHOTO

Federer, who received a first-round bye, would have been forgiven for expecting an easier start to the Tokyo tournament, but came up against a plucky 20-year-old making his debut in an ATP event -- and the Serbian showed little sign of stage-fright.