Nadal's season ends in painful defeat by Goffin

Tennis - ATP World Tour Finals - The O2 Arena, London, Britain - November 13, 2017 Spain's Rafael Nadal gestures to fans after losing his group stage match against Belgium's David Goffin Action Images via Reuters/Tony O'Brien

LONDON (Reuters) - Rafael Nadal's unforgettable season came to a painful end when he withdrew from the ATP Finals with a knee injury after defeat in his opening round-robin match against David Goffin on Monday.

The Spaniard, already assured of ending the year as world number one having won a 10th French Open title and the U.S. Open, was clearly hobbling as he went down 7-6(5) 6-7(4) 6-4.