The end of the big three era? A look at the state of men’s tennis

Roger Federer, Rafael Nadal and Novak Djokovic (PA)

For the second successive year, the final of the Nitto ATP Finals will not feature Novak Djokovic, Roger Federer or Rafael Nadal.

With Dominic Thiem and Daniil Medvedev both beating Djokovic and Nadal at London’s O2 arena, the PA news agency asks, is this the end of an era?