Roger Federer defeated big-serving Sam Groth 6-4, 6-4, 6-4 in a second-round matchup last night at the U.S. Open. Although the scoreline would indicate a routine win, Groth had his moments and gave the Swiss Maestro more of a match than many would have thought. The second-seeded Federer hit nine aces, won 84 percent of his first service points and broke the big Aussie’s serve five times with superb returning. Groth had eight aces and broke Federer twice. Federer improved to 54-1 in Grand Slam second round matches, with his only loss coming at Wimbledon last year to Sergiy Stakhovsky. The No. 104-ranked Groth, who won his maiden Challenger Tour title earlier this year at Rimouski, was coming off his first Grand Slam match win on Tuesday over Albert Ramos-Vinolas. Groth went blow-for-blow with Federer through the first six games before the 33-year-old Swiss earned a crucial break in the seventh game, which was the difference in the first set. Down two sets to love, Groth broke Federer to take a 4-2 lead in the third and twice had game point to go up 5-2, but Federer fought back for the break and broke again in the ninth game. The Swiss closed it out on his serve with an ace on match point. Federer managed to return Groth’s fastest serve, a 147-mph missile, and hit a winner off a 142 mph serve. “He’s got unbelievable power, so my arm’s still vibrating a bit,” Federer joked afterward. Groth hit 37 winners to 36 for Federer, but committed 30 unforced errors to 21 for his opponent. All in all, Groth handled the scene of Arthur Ashe Stadium and the occasion very well. ”I was trying not to get caught up in the whole ‘Roger act’ out there,” Groth said. “You walk out, you get a few cheers. He walks out and the crowd goes ballistic. So from the word ‘Go,’ you know he’s there.” Federer meets Spaniard Marcel Granollers in the third round.