Rafael Nadal spent much of his career battling Novak Djokovic and Roger Federer - but the Spaniard has shared his true feelings about his rivals.

The trio rank among the wealthiest sportsmen in the world, but the family wealth of a current top 10 player eclipses all their many millions combined.

Rafael Nadal is saying goodbye to his life's work. The athlete recently retired after participating in the Davis Cup, and shared an emotional letter where he discussed some of the things he's learned with tennis and some of the highs and lows of his unparalleled career.

Nadal’s decision to retire was rooted in the physical toll the sport had taken on his body and the mental strain he endured over decades of competition.