(Source: Tennis Canada) Ideally, the ATP World Tour Finals is a down-to-the wire extravaganza that ties a neat bow on the tennis year. Unfortunately for tennis thrill seekers, the 2015 men's season is done and dusted regarding the No. 1 ranking. Novak Djokovic has been so dominant that the only thing really left to determine is just how far ahead of the No. 2 - likely Andy Murray but still possibly Roger Federer - he will be. Here's how those three players stood entering this year's World Tour Finals currently underway at the O2 Arena in London. Djokovic 15,285 points. Murray 8,470 points. Federer 7,340 points Finishing in the top spot means Djokovic has been No. 1 in four of the past five...
                       
                           
                       
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