Simple for Roger Federer
A review of the rest of the action from day four of the men's singles at the US Open.
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Roger Federer booked his place in the third round of the US Open with a routine win over Carlos Berlocq.
Federer, seeded seventh in New York after a gradual decline in form, rarely looked anything other than comfortable as he grew into a match which he took 6-3 6-2 6-1.
He was better than the Argentinian in every department and will take comfort from an impressive display on serve.
The Swiss won 75 per cent of the points on his first delivery and 67 per cent on the second, adding in 37 winners for good measure.
Seven from 13 break points were also cashed in and the winner of Adrian Mannarino against Sam Querrey awaits.
Rafael Nadal made short work of Rogerio Dutra Silva to race into the third round.
The Spaniard dropped just three games in a one-sided 6-2 6-1 6-0 victory over the Brazilian qualifier in the final match of the night on Arthur Ashe, the fewest games he has ever lost in a grand slam match on hard courts.
The victory, which took only an hour and 32 minutes, extended Nadal's winning record on hard courts this season to 17-0.
Fourth seed David Ferrer is another man trying to find his form, and he dropped a set against his fellow Spaniard Roberto Bautista Agut but came through 6-3 6-7 (5/7) 6-1 6-2.
There were straight-sets victories for Richard Gasquet and Janko Tipsarevic.
The final match of the night ended just before midnight with 13th seed John Isner beating Gael Monfils 7-5 6-2 4-6 7-6 (7/4) in a hugely entertaining contest.
Flamboyant Frenchman Monfils is a crowd favourite wherever he goes but it was unusual to hear the normally ultra patriotic American crowd chanting 'Monfils, Monfils' when he took the third set.
Isner won the crowd back onto his side during the fourth set and flung his racket to the floor when he finally clinched victory in the tie-break.
Next up for Isner is Philipp Kohlschreiber - a rematch of a contest at the same stage last year when the German won in five sets after 2am.
Tenth seed Milos Raonic had a much more straightforward contest against Pablo Andujar of Spain, winning 6-1 6-2 6-4, and next meets Feliciano Lopez.
On Friday, top seed Novak Djokovic takes on Benjamin Becker of Germany while the night session features an attractive-looking contest between two former champions, sixth seed Juan Martin del Potro and Lleyton Hewitt.