Milos Raonic withdraws from World Tour Finals

World number eight Milos Raonic has withdrawn from the World Tour Finals at London's O2 Arena with a quad injury.
Spain's David Ferrer, who is the first alternate, will step in to play Japan's Kei Nishikori on Thursday.

The change means Britain's Andy Murray, who is also in Group B, will be eliminated
if he loses to Roger Federer this evening.
"You, the fans deserve a great show and I wouldn't step out if I couldn't," tweeted Canadian Raonic.
"I am sorry for the fans. I will do everything to b next year."
Raonic lost his two opening Group B matches against Federer and Murray.
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