Andy Roddick produced a stunning display of raw power to crush Rafael Nadal 6-0 6-3 6-4 at the US Open.
The match was expected to be one of the highlights of the first week but 18-year-old Nadal was simply overwhelmed.
The American fired down a 152mph serve in his opening service game and dropped just nine points in the first set.
Nadal regained some pride in a tight third set and went a break up before Roddick levelled at 4-4 and broke the Spaniard again to seal victory.
"I felt like I played really well for the first two sets," Roddick said.
"I kind of had a concentration lapse at the start of the
third set but I was able to come through in the end."
Roddick will meet 29th seed Argentine Guillermo Canas in the next round.
Fourth seed Lleyton Hewitt gave another display of his title credentials with a 7-6 (9-7) 6-1 6-2 win over Morocco's Hicham Arazi.
The gifted Arazi was at his brilliant best in the first set and Hewitt was warned by the umpire for slashing a ball away in anger.
Hewitt is in good form
But the Australian stepped up a gear to save two set points in the tiebreak and Arazi could not recover.
Hewitt faces Spain's Feliciano Lopez in the third round.
The Australian said he was grateful to come through a potentially tricky match in straight sets.
"It's always good to get the first set, especially against a guy who's flashy and capable of some great shots," he said.
"I wasn't as aggressive right at the start today as I was two days ago. But I felt like I really stepped it up early in the second set.
"He's got a crafty kind of game. You've got to try and dictate play out there."
Elsewhere, eighth seed David Nalbandian made a surprise second-round exit to Mikhail Youzhny.
Nalbandian, who lost in the semi-finals last year, was beaten 7-6 (7-4) 4-6 5-7 6-2 4-6 by the Russian.
Nalbandian has been dogged by injury all year and was playing only his second tournament since May.
Former world number two Tommy Haas booked his place in the third round with a 6-4 6-4 1-6 6-1 win over 12th seed Sebastien Grosjean.
The German is rediscovering his best form following a 15-month absence with a shoulder injury.
Haas next faces Brazil's Ricardo Mello as he bids to reach the fourth round in New York for the fourth time in his career.
Spain's Tommy Robredo is also into the third round after a win over Frenchman Arnaud Clement.