Making a fortune both on and off the field, the world's sporting giants have boosted their wealth spectacularly over the past 12 months. Fuelled by everything from Saudi money and skyrocketing salary caps to ever-more lucrative endorsement deals, their incomes have positively surged, according to the latest Forbes round-up.

Read on to discover the top 20 highest earners in sport today, along with the top five under 25. Spoiler alert: despite the rising profile of women's sport, no female stars cracked the top 50 of this year's Forbes list, let alone the top 20.

All dollar amounts in US dollars.