World number one Nadal was on court for less than two hours

Rafael Nadal strolled into the fourth round of the US Open with an easy win over Serbia's Viktor Troicki.

The world number one trailed 3-1 in the second set but won 11 straight games to clinch a 6-4 6-3 6-0 victory.

The top seed will meet Sam Querrey in the last 16 after the unseeded American beat danger man Ivo Karlovic of Croatia 7-6 (7-5) 7-6 (7-5) 6-2.

Fourth seed David Ferrer went out on Saturday after losing an epic five-set contest against Japan's Kei Nishikori.

The world number four fought back from two sets down and then recovered from 5-2 down in the decider.

But rising star Nishikori, playing in only his second Grand Slam, finally sealed victory on his second match point, the 18-year-old prevailing 6-4 6-4 3-6 2-6 7-5 after three hours and 32 minutes.

Nishikori now meets Argentine 17th seed Juan Martin del Potro, who also came through a marathon encounter as he beat France's Gilles Simon 6-4 6-7 (4-7) 6-1 3-6 6-3.

Querrey faces an unenviable task against Nadal as he makes his debut in the fourth round of a Grand Slam.

The Spaniard, seeking his first US Open title, believes he is only just coming into form in New York.

606: DEBATE Can Querrey trouble Nadal?

"The truth is that I was practising much better yesterday than the first few days," said the French Open and Wimbledon champion.

"I think I am ready to play a good match in the fourth round. I know I have to play a good match if I want to win."

Querrey faced the Spaniard in 2006 - his first year as a professional - and won the first set in Cincinnati before losing in three.

"Hopefully I've gotten a lot better since then," said the 20-year-old.

"He has too. It should be a good match. I don't have anything to lose, so I can go out there and rip away and take some chances."

Tenth seed Stanislas Wawrinka recovered from two sets down to beat Italian Flavio Cipolla 5-7 6-7 (4-7) 6-4 6-0 6-4 and set up a fourth-round match against Andy Murray.

Mardy Fish came out on top in an all-American clash with James Blake winning in straight sets 6-3 6-3 7-6.

Fish, ranked 35 in the world, will meet France's Gael Monfils in the last 16 after he upset Argentine seventh seed David Nalbandian.

The 32nd seed powered through in straight sets 6-3 6-4 6-2, celebrating with a jig to delight the Flushing Meadows crowd.

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