Roger Federer said that he was 'happy but exhausted' after his ATP World Tour Finals victory against Jo-Wilfried Tsonga.
The 30-year-old, who was appearing in his 100th career final, took three sets to retain his title at the O2 in London.
"I couldn't be more happy, I couldn't be more exhausted," said Federer.
"Jo sapped every last bit of energy out of me. There couldn't be a better way for me to finish the season.
"I really enjoyed every minute of being here, see you next year."
The win also claimed Federer his 70th career title.
