Wednesday's action at the Masters Cup begins with a glum Andy Roddick announcing his withdrawal because of an ankle injury

First on court in the Red Group is Andy Murray and the British number one races to a 4-0 lead over Frenchman Gilles Simon

Murray does not have it all his own way, however, and his frustration is evident as the Frenchman fights back

Despite his improvement, Simon still sees the first set slip away and he cannot build on a good start to the second set either

Murray is able to celebrate what became an eventually comfortable victory that ensures he will be in the semi-finals in Shanghai

World number 27 Radek Stepanek is the lucky man to step in following Roddick's withdrawal, and he is up against Roger Federer

Top seed Federer, who needs to win to keep his hopes of reaching the last four alive, takes a tight first set on a tie-break

Federer had to work hard against a battling Stepanek. It was nip and tuck all the way with Federer making a number of unforced errors

Cheered on by the Chinese crowd Federer eventually comes through to win 7-6 6-4. He now needs to beat Andy Murray to progress