Roger Federer claimed a record sixth victory in year-ending ATP championships after defeating Jo-Wilfried Tsonga 6-3 6-7 6-3 at the World Tour Finals. The 16-time grand slam champion, who was also playing in his 100th career final, held his nerve to fight off a spectacular comeback from his French opponent. Tsonga looked to be heading for a quick defeat as Federer served for the match in the second set, but some free-hitting sparked him into life and he levelled the match in a tie-break. But Federer hit his stride again in the third and the sixth seed finally buckled under the pressure, allowing the defending champion to complete the win and surpass Pete Sampras and Ivan Lendl on the list of multiple Tour Finals winners. Federer became the tournament's oldest winner with his 70th final victory and will take a winning streak of 17 matches into next season, said: "I couldn't be more happy and I couldn't be more exhausted." Read Full: Optimum Sports Marketing: Federer Claims ATP Number Six:
