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Becoming a father has not affected Novak Djokovic's drive and motivation.

The top-ranked Serb won his 20th Masters title in Paris last week in his first tournament since the birth of his baby boy, Stefan. Childcare duties have not lessened his desire to finish the year as the world's top-ranked player for the third time.

Djokovic is also trying to become the first player to win three straight ATP Finals since Ivan Lendl in 1985-87 as the action started yesterday in London.

''Of course certain things change, psychologically, but when you are playing for someone, someone who is your son, of course it's an extra motivation, Djokovic said.

''My wife and I had the blessing of becoming parents recently and this is the most beautiful thing you can experience. The first tournament after that happened was in Paris, and I won without dropping a set. We should be making more kids I guess.''

Unbeaten in 27 matches on indoor courts, Djokovic took a big step toward finishing the year at the top by extending his lead over Roger Federer to 1,310 points in Paris.

A potential 1,500 points are on offer in London and Federer, who will also have the opportunity to earn some extra points in Switzerland's Davis Cup final against France later this month, still has an outside chance of pipping the Serb.  -- AP