Rafael Nadal called time on his illustrious tennis career last year, but the Spaniard is still keen to compete against his former 'Big Four' rivals in another sport

Federer and Nadal have retired, but Djokovic still dreams about chasing notable titles even at 38! The Serb is still ranked in the top-5, reaching the Wimbledon final a year ago a

With two of his greatest rivals now retired, Novak Djokovic remains the last standing member of the Big Three. This has led the Serbian superstar to admit he may not be as eager to take to the court as he used to be in the past.