Former world No. 1 who retired at 28 without winning any Grand Slam, criticized Djokovic, Federer, and Nadal

Marcelo Ríos is widely regarded as the greatest Chilean tennis player in history. But his career was never far from controversy.

• Former world No.1 who has more Grand Slams than 'Big Three' and faced a career-changing lawsuit
• Former Wimbledon champion, forced to retire due to injury, explains why Djokovic is better than Federer