Jo-Wilfried Tsonga has joked that he might be able to win titles when Roger Federer retires.
The Frenchman was beaten in three sets by the world number four in their encounter in the final of the ATP Finals at the O2 in London on Sunday.
"Congratulations, Roger," said Tsonga. "Without you, I can maybe get some other titles. But you are here, you are the best. It's amazing to play on this court and be in London."
The win was Federer's 70th title in his 100th career final appearance.
