Novak Djokovic has dismissed claims from Rafael Nadal that he is in another league to the rest of men's tennis ahead of their semi-final at the ATP World Tour Finals.
Djokovic has enjoyed an incredible year, winning three of the four grand slams in 2015, with his 23-match winning streak finally ended by Roger Federer on Tuesday.
Federer defeated the world number one 7-5 6-2 but Djokovic bounced back on Thursday to progress from the round-robin stage by beating Tomas Berdych 6-3 7-5.
The Serbian now faces Nadal for a place in the final and seems set to be sternly tested by a rejuvenated Nadal, who eased to a 6-4 6-1 victory over world number two Andy Murray on Wednesday.
Despite his recent resurgence, Nadal insisted Djokovic was "in another league" following the Spaniard's triumph against Murray.
However, Djokovic said: "I take it as a compliment, obviously. But I don't consider myself in another league. I'm competing with everybody else equally for this trophy as any other trophy.
"I think it wouldn't be fair for myself and it would be a little bit pretentious or arrogant if I say, yes, I'm in another league.
"Of course I would never say that. I'm just going to have the same approach as everybody else and try to win every match that I play on."
On Nadal's upturn in form, Djokovic added: "He's been raising his level ever since the US Open, I think.
"Already in China, playing finals in Beijing, semi-finals in Shanghai, you can feel that he's starting to get comfortable on the court, starting to play better.
"The couple of matches, first couple of matches he played here against [Stan] Wawrinka and Murray showed that, showed that he feels more confident, shows that he's starting to miss less, serve efficiently, use his forehand much better.
"I'm going to get ready for that one and hopefully I'll be able to play at my best."