(AP Photo/Kirsty Wigglesworth)

LONDON (AP) After being thoroughly outplayed by defending champion Alexander Zverev at the ATP Finals, Rafael Nadal refused to make any excuses.

The top-ranked Spaniard wouldn't blame the abdominal problem that forced him to pull out of the Paris Masters semifinals just nine days earlier, or a hand injury that kept him sidelined before that. And he bristled at the notion that his recent marriage could be a factor in a sub-par performance.

Something was clearly off for Nadal, though, who lost 6-2, 6-4 to a player he had a perfect 5-0 record against before Monday's match at the O2 Arena.

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