No looking back now

World No 1 Rafael Nadal hopes the worst is behind him after struggling past Sam Querrey to reach last eight.

World number one Rafael Nadal said he hoped he had gotten his bad day out of the way at the US Open, and was happy to reach the quarter-finals at Flushing Meadows on Monday.

Nadal, winner of Olympic gold in Beijing, is aiming to end arch rival Roger Federer8217;s run of four straight triumphs at the US Open. The Swiss player may have taken heart from Nadal8217;s less than perfect performance in the fourth round. French Open and Wimbledon champion Nadal defeated American Sam Querrey 6-2, 5-7, 7-6, 6-3, but struggled at times, double faulting at important moments and proving erratic on his usually trusty, killer forehand.

8220;In every tournament you have one bad day, that8217;s the normal thing,8221; Nadal told reporters. 8220;When you are playing not your best, the important thing is to win. I did today.8221;

High unforced error count

Nadal8217;s tally of unforced errors was unusually high at 41, and his six double faults outnumbered his five aces. But he said he was pleased to have pulled out his best shots during the third-set tiebeaker, which he won 7-2.

The 22-year-old Spaniard will next meet another American, Mardy Fish, who reached his first US Open quarter-finals by defeating French 32nd seed Gael Monfils.

Fish defeated fellow American James Blake in the previous round and Nadal said he would be a dangerous opponent, with a big serve, and a good backhand and volley. 8220;Probably I am not in the freshest moment in my life, but I am fine,8221; said Nadal, who has won 42 of his last 43 matches in a hectic schedule. 8220;The important thing is I am there. I am in the quarter-finals. I have a tough match against Fish. I have to play my best.8221; Querrey, who played a string of winners on his forehand and belted 20 aces, advised his compatriot to take the game to Nadal. 8220;If he comes in at the right times I think he could have a shot,8221; Querrey said.

Murray storms into quarters

BRITISH sixth seed Andy Murray stormed into the quarter-finals of the U.S. Open for the first time with a 6-1, 6-3, 6-3 demolition of Swiss 10th seed Stanislas Wawrinka on Monday. Murray dominated Wawrinka in every department of the game, racing to victory in one hour 49 minutes.

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Kei Nishikori8217;s ground-breaking US Open run came to an end in the fourth round with a 6-3, 6-4, 6-3 defeat by Juan Martin del Potro of Argentina. The 18-year-old, the first Japanese man to reach the last 16 in the US Open since 1937, was outgunned by the 17th seed ,who extended his winning streak to 23 matches.