Former champion Andy Roddick gave young American Rhyne Williams a harsh introduction to grand slam tennis as he breezed to a 6-3 6-4 6-4 victory in their US Open first-round clash.
The 29-year-old, whose only grand slam title to date came in 2003, banged down 20 aces as he claimed victory on a sweltering day at Flushing Meadows.
Williams, a qualifier ranked 289th in the world, gave a good account of himself on the vast Arthur Ashe Stadium court but Roddick had too much experience and class for him.
The 20th seed now awaits the winner of the match between Australia's Bernard Tomic and Carlos Berlocq of Argentina.
Jo-Wilfried Tsonga and Tomas Berdych both eased through to the second round but dark horse Milos Raonic was pushed all the way by Colombia's Santiago Giraldo.
The Canadian 15th seed is the brightest of the next generation and is seen as a potential threat to the big names but he looked on his way out at two sets to one and a break down.
Raonic, a potential fourth-round opponent for Andy Murray, was decidedly out of sorts in the roasting conditions at Flushing Meadows but turned things around to win 6-3 4-6 3-6 6-4 6-4 in three hours and 25 minutes.
Fifth seed Tsonga had no such problems against Slovakia's Karol Beck, although he did have to come from a break down in the third set to triumph 6-3 6-1 7-6 (7/2).
The Frenchman said: "I think I played good tennis the first two sets, and after that I lost a bit of concentration at the beginning of the third set.
"Then I put in some effort to come back. It was not easy today because the weather was hot. I'm happy to go through this round really quickly."
Sixth seed Berdych was tested by talented Belgian David Goffin, who reached the fourth round of the French Open as a lucky loser, but did not lose a set, coming through 7-5 6-3 6-3.
The Czech saved 16 of the 18 break points he faced, and he said: "It's a good statistic for me. I think he has a pretty good future ahead of him. If he keeps doing what he's doing, then I think we can see him quite high in the future."