Federer through to face Monfils
A review of Tuesday's men's singles action at the US Open, including wins for Roger Federer and Gael Monfils.
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Gael Monfils upset Grigor Dimitrov in unexpectedly comprehensive fashion to reach his second US Open quarter-final.
It was the best match-up of the fourth round in the bottom half of the draw but seventh seed Dimitrov was off his game and went down 7-5 7-6 (8/6) 7-5.
Monfils, who is likely to meet Roger Federer next, is one of the most enigmatic characters on tour and infuriates as much as he entertains with his frequent inability to turn talent into results.
But for most of Tuesday's match, which was played in high humidity, he was calm and controlled, allowing Dimitrov to implode under the weight of expectation.
The Bulgarian cracked first in the 11th game of the opening set, with Monfils serving it out confidently.
The Frenchman saw an early break slip away in the second and had a brief meltdown but it was Dimitrov who collapsed in the tie-break, four errors from 6-4 handing the set to Monfils.
And when he served to stay in the match in the 12th game of the third, Dimitrov again faltered, finishing the contest with a meek double fault.
Monfils' only previous trip to the last eight at Flushing Meadows came four years ago, when he lost to Novak Djokovic.
The Frenchman, who is yet to drop a set, also made the quarter-finals at the French Open this year, going down in five sets to Andy Murray.
Next for him this time around is Roger Federer after the Swiss buried another of last year's ghosts by defeating Roberto Bautista Agut in straight sets.
Twelve months ago, the 17-time grand slam champion was a shadow of himself in a straight-sets loss to Tommy Robredo in the fourth round.
He has turned his form around impressively this year and against another Spaniard a repeat never looked on the cards.
Federer was not quite at his brilliant best and allowed Bautista Agut to claw his way back from 5-1 to 5-4 in the opening set.
But he kept his nose in front throughout and emerged a 6-4 6-3 6-2 winner to set up a last-eight meeting with Monfils.
Kei Nishikori also booked his place in the quarter-finals after an epic encounter with fifth-seeded Canadian Milos Raonic which finished at 0226 in the morning local time - the joint latest finish in US Open history.
Nishikori, the 10th seed from Japan, looked on his way out as he trailed 2-1 heading into the fourth set but battled back to take the match 4-6 7-6 (7-4) 6-7 (6/8) 7-5 6-4 and set up a clash with Wawrinka.
The encounter lasted well over four hours but provided great entertainment for the sizeable crowd that stayed until the early hours to watch its completion.
Fourteenth seed Marin Cilic reached his second straight grand slam quarter-final with a gruelling 5-7 7-6 (7/3) 6-4 3-6 6-3 victory over Gilles Simon.
The Croatian, who missed last year's tournament following a positive doping test, had never beaten Simon in four previous attempts and celebrated exuberantly at the end.
Cilic said: "It's amazing and really important. I knew Gilles would not go away that easily. All of our matches were very close but eventually he was always winning.
"I was mentally focused to be always in the game even though I lost the fourth set. I think I played really well in that last set."
He next plays sixth seed Tomas Berdych, who ended the run of 20-year-old Austrian Dominic Thiem in brutal fashion, winning 6-1 6-2 6-4.