Shanghai - Jo-Wilfried Tsonga claimed his third revenge win in two months over Novak Djokovic as he produced a 1-6, 7-5, 6-1 Gold group comeback to spoil the Serbs hopes for a perfect record on Thursday at the Masters Cup.

The 23-year-old Tsonga is out of consideration for a semi-final spot, but earned a moral victory over the man who beat him in the Australian Open final in January. Djokovic ended with a 2-1 mark.

Shanghai- Jo-Wilfried Tsonga claimed his third revenge win in two months over Novak Djokovic as he produced a 1-6, 7-5, 6-1 Gold group comeback to spoil the Serb's hopes for a perfect group record on Thursday at the Masters Cup.

The 23-year-old Tsonga is out of consideration for a semi-final spot, but earned a moral victory over the man who beat him in the Australian Open final in January. Djokovic ended with a 2-1 mark.

Tsonga has now proved his point over the world number three in the Bangkok final and third round at Paris Bercy in addition to the year-end spectacular.

Shanghai - ATP executive candidate Brad Drewitt on Thursday defended the decision to increase the 2009 player workload in exchange for more prize money after Andy Roddick charged that an over-heated schedule is leading to injuries on court.

Roddick withdrew with some frustration on Wednesday after rolling his ankle in training and handing a spot in the eight-man Masters Cup wrap-up event to alternate Radek Stepanek.

Shanghai - World number one tennis player Rafael Nadal is suffering from serious physical problems, the president of the International Tennis Federation (ITF), Francesco Ricci Bitti, said on Wednesday.

"Nadal has a very serious problem," Ricci Bitti told a small group of media, including Deutsche Presse-Agentur dpa, at the Masters Cup tournament in Shanghai.

Shanghai - Andy Murray rolled into the semi-finals in his debut week at the Masters Cup, defeating Frenchman Gilles Simon 6-4, 6-2 in a Red group showdown on Wednesday.

The Scot polished his record to a perfect 2-0 as he beat the last player to enter the eight-man field. Simon gained a place at the last minute when world number one Rafael Nadal pulled out with a knee injury which will require a month or more to fully heal.

'Simon obviously is playing the best tennis of his life and he's in the top 10," said Murray.

Shanghai - Andy Murray rolled into the semi-finals in his debut week at the Masters Cup, defeating Frenchman Gilles Simon 6-4, 6-2 in a Red group showdown on Wednesday.

The Scot polished his record to a perfect 2-0 as he beat the last player to enter the eight-man field. Simon gained a place at the last minute when Rafael Nadal pulled out with a knee injury which will require a month or more to fully heal.

Roger Federer was fighting to stay in the chase later as the Swiss holder faced Radek Stepanek after losing an opening match to a Simon comeback effort on Monday.