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Janko Tipsarevic

No. 1 Djokovic stretches ATP finals winning streak to 15

Right now, Novak Djokovic is about as good as it gets on a tennis court.

The top-ranked Serb put on an impressive display against Kei Nishikori at the ATP finals on Sunday, stretching his winning streak to 15 matches at the season-ending tournament with a 6-1, 6-1 win at the O2 Arena.

"I think I was at my best," said Djokovic, who has won the last three titles at the ATP finals and four overall. "Undoubtedly it's been an incredible performance that I was hoping I can have coming into the match, coming into this tournament."

Djokovic lost only nine points on his serve and never faced a break point. With Nishikori serving, Djokovic won 30 of the 53...