Novak Djokovic will take on Roger Federer in the final of the ATP Tour Finals at London's O2 Arena today after both had to dig deep in their semi-finals. All week the tournament has seemed destined to come down to a meeting between the world's top two players but the script was nearly ruined. Federer saved four match points to win an epic all-Swiss battle against Stan Wawrinka 4-6 7-5 7-6 (8/6) while Djokovic emerged from his first serious test of the tournament to beat Japan's Kei Nishikori 6-1 3-6 6-0. Three times...
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