The Japanese star has yet to reach the second week at Roland-Garros and Wimbledon, but that could change soon.
"I agree with Sascha. It's too stagnant, perhaps not a true ranking," Martina Navratilova said.
Hall of Famer details strengths, weaknesses and potential of world No. 35.
"They do not support Novak for something that is generally good for those people who can barely make ends meet," Srdjan Djokovic said.
In a touching Instagram post, Nick Kyrgios offers aid to followers enduring dark days.
The Canadian says he'll play less in order to keep his mind fresh during a difficult time on tour.
The two-time Roland Garros finalist is hoping to clear his head and find his form this spring on his favorite surface.
