(AP Photo/Tim Ireland)
LONDON (AP) Rafael Nadal will have to wait another year to win the ATP Finals.
The world No. 1 withdrew from the elite, season-ending tournament after losing his opening match to David Goffin 7-6 (5), 6-7 (4), 6-4 on Monday at the O2 Arena.
Nadal pulled out of the Paris Masters at the quarterfinal stage 10 days ago and admitted ahead of the ATP Finals on the indoor hard-court he struggles on, that his knees, which have caused him trouble throughout his career, were still "not perfect."