A mouthwatering finale to the season ended before it even began when Roger Federer was forced to pull out prior to the ATP World Tour Final showdown with Novak Djokovic.

The 33-year-old Swiss, who spent nearly three hours late on Saturday beating compatriot Stanislas Wawrinka in a gruelling semi-final, announced his decision on court as the O2 Arena filled up for the expected final.

Federer, who was bidding for a seventh title at the year-ender, apologised but said he was not "match-fit" after developing a back problem.

"I hope you understand I wanted to come out personally and excuse myself for not playing ... I can't compete without a back at this level," he told the crowd who still warmly applauded, despite their obvious disappointment.

ATP president Chris Kermode, standing alongside Federer, then announced that Andy Murray, who failed to qualify for the semi-finals after being thrashed by Federer on Thursday, would play Djokovic in a one-set exhibition match instead.

Federer hopes to play for Switzerland against France in the Davis Cup final which starts on Friday.

Sign up to our free newsletters

Get the best updates straight to your inbox:
Please select at least one mailing list.

You can unsubscribe at any time by clicking the link in the footer of our emails. We use Mailchimp as our marketing platform. By subscribing, you acknowledge that your information will be transferred to Mailchimp for processing.