Injured Nadal withdraws from ATP Finals

World number one Rafael Nadal has been forced to withdraw from the ATP Finals due to a knee injury.

A stricken Nadal lost his opening match at the O2 Arena in London, the 16-time grand slam champion upstaged by David Goffin in three sets on Monday.

Nadal - who was already in doubt for the season-ending event after a knee injury meant he had to pull out of the Paris Masters - looked uncomfortable in the 7-6 (7-5) 6-7 (4-7) 6-4 defeat in Group Pete Sampras.

Fellow Spaniard Pablo Carreno Busta has replaced the 31-year-old reigning French and US Open champion as an alternate.

Nadal's exit has opened the door for 19-time major winner Roger Federer to claim a record seventh ATP Finals crown.

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