World No. 1 Djokovic unconditionally crowns Federer 'dad No.1'

World number one Novak Djokovic has unconditionally crowned 17-time Grand Slam champion Roger Federer as the best 'dad', as the two are seeded to meet in the final of the ATP World Tour Finals in London next weekend.

Djokovic might be the top seed and favourite in the season-ending classic which begins on Sunday as he shoots for a third straight title, but when it comes to juggling tennis and fatherhood, this new dad accepts father-of-four Federer is still the undisputed champ.

Djokovic said that he is still far off from Federer, adding that four kids and it's pretty amazing to still play at such a high level as the Swiss does, Stuff.co.nz reported.

The Serb marveled at how Federer seems to have rediscovered his most ethereal form in the months following the birth of his and wife Mirka's second set of twins in May.

He said that he can understand what an effort it is with one kid, adding that with four he can't imagine.

Maybe, but Djokovic has made a fairly extraordinary start to life as a racket-wielding dad, winning the Masters title in Paris last weekend in his first tournament since he and wife Jelena celebrated the birth of Stefan in October.

He won with ease, too. A smiling Djokovic agreed that he won without dropping a set and they should be making more kids, in future, before conceding that Jelena might not be overly impressed by these public musings.