Djoker's mother thinks there is no debate.
After he won Wimbledon in 2011, his mother proclaimed, “For four years, it was Roger, Rafa, Rafa, Roger,” said Djokovic’s mother, Dijana. “Now it is Novak, Novak, Novak, Novak.” http://www.nytimes.com/2011/07/04/sp...ael-nadal.html
This was after she boasted when her son won the Australian Open in 2008 (referring to Roger) "The king is dead!"
Not so fast, Dijana. Since Wimbledon '11, the Slam winners are: Djokovic (US Open), Djokovic (Australian), Nadal (French), Federer (Wimbledon), Murray (US Open). Plus, now Federer stays safely as king at #1, setting the all-time record for weeks at that ranking.
Looks like banking on Nole's mother's predictions aren't a good bet.