Rafael Nadal fought hard to beat fellow Spaniard Tommy Robredo 6-1 6-4 in the third round of the Shanghai Masters.

After making light work of the first set, the top-seeded Nadal fell 2-0 behind in the second set before eventually coming good.

Nadal is joined in the fourth round by second seed Novak Djokovic, who dispatched qualifier Rainer Schuettler of Germany 6-4 6-2.

Few matches were entirely straightforward today, however, and third seed Nikolay Davydenko had to work hard to beat Chile's sixth-seeded Fernando Gonzalez 6-3 7-5.

Fifth seed Jo-Wilfried Tsonga is out after going down 6-3 6-3 to Sweden's Robin Soderling, the ninth seed, and 11th seed Gael Monfils is also on his way home after retiring hurt whilst trailing Ivan Ljubicic 6-2 3-0.

Stanislas Wawrinka was doing a good job of putting a scare into 13th seed Radek Stepanek, winning the opening set 6-3 then narrowly losing the second 7-6 (7/5), but the Swiss then retired hurt in the third set, trailing 4-2.

Eighth seed Gilles Simon beat Tomas Berdych 6-3 6-4, while Feliciano Lopez recovered from losing the opening set to see off Austria's Jurgen Melzer 5-7 7-6 (7/3) 6-1.