Roger Federer produced one particularly brilliant backhand lob that he celebrated by wagging a finger overhead during a straight-set second-round victory at the U.S. Open. (Also Read: Halep, Venus Knocked Out)
The second-seeded Federer beat 104th-ranked Sam Groth of Australia 6-4, 6-4, 6-4 on Friday, improving to 24-1 for his career in night matches held in Arthur Ashe Stadium.
Federer is also 54-1 in second-round Grand Slam matches; the only loss came at Wimbledon last year. (Read: Jankovic Advances to Last 16)
He limited the big-serving Groth to eight aces and broke him five times.
In the second set's final game, Federer closed a 17-stroke exchange by sliding to his backhand side, stretching and flicking a high-arching lob that landed in. Federer raised his right hand and made a "No. 1" gesture with his index finger.
Federer next faces 42nd-ranked Marcel Granollers.