After disposing of the French fourth seed, Belgium's US Open champion now faces Anna-Lena Groenefeld.
Mr. Scott has finished no worse than a tie for 15th (2012 US Open).
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It was Federer's first ATP match since winning his fourth US Open early in September.
Murray plans to rest ahead of a busy summer with the Olympics and US Open.
The US Open at Flushing Meadows in New York gets under way on 31 August.
Montgomerie tees off his US Open campaign alongside Americans David Duval and John Cook.
It was a disappointing day for US Open champion McDowell and ex-Ryder Cup captain Colin Montgomerie.
This slideshow covers ever the US Open venue you can play in their entirety.
"(The situation is) the same as it was before the US Open, " he said.
"It's disappointing because I started off so poorly again, " said the three-time US Open champion.
At 7, 264 yards, Winged Foot's West Course is the longest lay-out in US Open history.
Rather than the World Cup, this is the RoboCup US Open held this week in Georgia.
But she hopes it will heal in time for the US Open beginning on 30 August.
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New Zealand's Michael Campbell will defend the US Open title he won last year at Pinehurst.
But Watson, who emulates Andy Murray's US Open junior triumph in 2004, proved just too powerful.
Campbell drew inspiration from his US Open triumph to birdie four of the last five holes.
This week, one golfer will emerge and have his name forever etched on the US Open trophy.
The Open, US Open and US Amateur champions are traditionally grouped together for the first two rounds.
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Howell was not the only big-name British star to see his US Open challenge disappear on Saturday.
Victory over Kelly would bring Casey a quarter-final against Retief Goosen or US Open champion Angel Cabrera.
Axley, 34, shared ninth at last month's US Open and won his only PGA title at the 2006 Texas Open.
"I've played here in the US Open in 2000 - I played OK, " added the Worksop golfer.
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He became the youngest player ever to complete the career Grand Slam with his 2010 US Open win.
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Tennis had a record audience of 4.5 million viewers on the back of Andy Murray's US Open victory.
But those two have never shared a bagel as they waited to play for the US Open title.
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The US Open champion leads the four-man event - for the season's Major winners - by five strokes.
The closest he came to landing one of the big four came in 2006 at the US Open.
American veteran Jay Haas, 52, was among the 21 qualifiers and will appear in his 27th US Open.
Me and Juan haven't played that much since the US Open and I kind of expected a scrappy match.
Murray, who first picked up the injury during the US Open, now plans to return in Valencia next month.
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