Tsonga stunned by Klizan

Unheralded Slovakian Martin Klizan caused the shock of the tournament on Thursday as he knocked out fifth seed Jo-Wilfried Tsonga in the second round of the US Open.

The Frenchman, who had been seeded to meet Olympic champion Andy Murray in the quarter-finals, was horribly out of sorts and crashed out 6-4 1-6 6-1 6-3.

Tsonga, a quarter-finalist here last year and a semi-finalist at Wimbledon last month, looked like he had turned things around in the second set but instead Klizan pulled away again in the third. The Slovakian then opened up a 4-0 lead in the fourth set and, although Tsonga responded to reduce the deficit to 4-3, it was not good enough.

Eleventh seed Nicolas Almagro had to fight back from two sets to one down to defeat German Philipp Petzschner 6-3 5-7 5-7 6-4 6-4 while 17th seed Kei Nishikori beat Tim Smyczek of the US 6-2 6-2 6-4.

American Mardy Fish, the 23rd seed, became the 10th player to recover from two sets down to win against Russia's Nikolay Davydenko, a new record for the US Open.

Fish proved the tougher in sweltering conditions on Arthur Ashe Stadium to win 4-6 6-7 (4/7) 6-2 6-1 6-2 while 30th seed Feliciano Lopez narrowly avoided the same fate, beating fellow Spaniard Pablo Andujar 6-4 6-1 6-7 (5/7) 3-6 7-5.

Almagro, meanwhile, will meet American teenager Jack Sock after he reached round three at a grand slam for the first time with a 6-2 6-2 6-4 victory over Flavio Cipolla of Italy.