The Brit believes Djokovic's Slam title will "climb to 11, 12, 13 and maybe more."
The Serb, who has won all three Masters events so far in 2015, is "exhausted after his exertions so far this season."
Haase beats Berankis to reach 2nd round of Estoril Open
Begu upset by Siniakova in 1st round of Prague Open
Estrella Burgos eliminates Troicki at BMW Open in Munich
Thoughts on Nadal, Sharapova, and their pre-Paris struggles.
Djokovic leads the race to Paris, but is Nadal right where he wants to be as well?
Unlikely hero Simona Halep has endeared herself to fans with a refreshing style of play.
Nerves and Novak: Can Rafael Nadal fend off both of these obstacles?