Novak Djokovic remains the man to beat on indoor courts. The defending champion made quick work of top-ranked Rafael Nadal 6-3, 6-4 to win the ATP World Tour Finals on Monday, extending his winning streak to 22 matches and claiming the elite season-ending title for the third time. Djokovic, who has not lost a match since his defeat to Nadal in the U.S. Open final, returned superbly from the start to move his Spanish rival around the court and prevent him from dictating the points. Nadal and Djokovic have been dominant this season. More...