New York ? Andy Roddick unfurled his body and unleashed a 140 mph ace that forced a line judge to duck as the ball slammed against the wall with a thud.

It was the loudest display Roddick produced Sunday in a 6-1, 6-3, 6-3 victory over Flavio Saretta to reach the U.S. Open’s fourth round. Roddick was the picture of calm, without a trace of the antics he used to pull — and which his prior opponent derided.

Instead, it was Saretta who clowned around, staring at a line when he thought a call was incorrect, kicking the ball, flipping his racket in the air or cracking it on the ground. The No. 4-seeded Roddick was all business.

“I’ve been playing like that the past three months,” Roddick said. “I just kind of realized I didn’t need to fight a mental battle every day.”

Andre Agassi doesn’t engage in antics these days, too concerned with saving every bit of energy and keeping track of each detail. So Agassi wasn’t pleased about not being consulted when his third-round match against Yevgeny Kafelnikov was suspended for nearly 24 hours early in the second set Saturday.

Not that it mattered in the end: The top-ranked Agassi wrapped up a 6-3, 7-6 (4), 6-4 victory Sunday to set up an Old vs. Young meeting with fellow American Taylor Dent in the round of 16 today. Dent stunned No. 15 Fernando Gonzalez Saturday.

“For the match to get called, and to be the only match that didn’t finish yesterday, I think was a mistake, an oversight in judgment,” the 33-year-old Agassi said.

Everything seems to come effortlessly for Roger Federer, who moved a step closer to being the first man since Pete Sampras in 1995 to win Wimbledon and the U.S. Open in the same year. The No. 2-seeded Federer reached the fourth round with a 6-3, 7-6 (4), 6-3 victory over unseeded American James Blake.

Now Federer will face No. 13 David Nalbandian, who’s won all four of their matches.

Andy Roddick returns a volley against Flavio Saretta during their third-round match at the U.S. Open. Roddick won, 6-1, 6-3, 6-3, Sunday in New York.

After losing to Roddick in the second round, Ivan Ljubicic complained that the American is too demonstrative on court. One wonders whether Ljubicic saw the end of No. 22 Younes El Aynaoui’s 7-6 (1), 5-7, 3-6, 6-3, 7-6 (5) victory over No. 10 Jiri Novak.

As Novak’s backhand flew wide on match point, El Aynaoui tossed his racket in the air and dropped to his back. He rose, blew some kisses to the crowd, then hopped, skipped and jumped over a wall to hug his trainer. Next, the Moroccan pulled off his shirt and tossed it into the stands.

El Aynaoui set up a fourth-round match against No. 7 Carlos Moya, who beat Nicolas Massu, 7-5, 6-4, 3-6, 6-3.

Nalbandian beat No. 20 Mark Philippoussis 7-5, 6-7 (10), 6-3, 6-2 in a match between the last two runners-up at Wimbledon.

No. 12 Sjeng Schalken, a 2002 semifinalist, ended the run of qualifier Ivo Karlovic, 7-6 (8), 7-6 (5), 7-6 (3), and will meet No. 8 Rainer Schuettler. Schuettler beat Alberto Martin 6-1, 6-4, 6-2.

The only past champion in the women’s field, third-seeded Lindsay Davenport, advanced to the quarterfinals by defeating No. 19 Nadia Petrova, 6-0, 6-7 (6), 6-2. Davenport will play No. 24 Paola Suarez, who got past Elena Likhovtseva, 6-2, 3-6, 7-5.

Davenport has won a total of three Grand Slam titles, but No. 1-ranked Kim Clijsters and No. 5 Amelie Mauresmo both are aiming to claim their first. Clijsters moved into the final eight by beating No. 17 Meghann Shaughnessy, 6-2, 6-4, while Mauresmo was a 6-2, 6-2 winner over Tamarine Tanasugarn.