Djokovic hails work ethic of Federer and Nadal

Roger Federer and Rafael Nadal’s consistency at the top of the men’s game in recent years is testament to their character and work ethic, says defending Wimbledon champion Novak Djokovic.

Federer and Nadal both open up at SW19 on Tuesday, with Federer playing Bosnia’s Damir Dzumhur and Nadal up against Thomaz Bellucci in the first round.