And our winner - the richest sportsperson on the face of the Earth - is Ion Tiriac! What do you mean 'who's Ion Tiriac'? You've never heard of two-sport Tiriac, who played both tennis and ice hockey professionally?
Tiriac is a proud Romanian with an impeccable sense of timing. When Communism failed in Romania in the 1990s, he moved quickly, investing the money he'd earned from sport into several business ventures, including the founding of Romania's first privately owned bank following the collapse. He also started up firms specializing in insurance, retail and car leasing, as well as an airline. With his name value as a Romanian sporting hero, and his investment driving them forwards, all of his companies became dominant in the Romanian market. By 2005 he was worth £1bn, and his fortune has continued to grow since then. Tiriac is a collector of rare and valuable cars, with a personal collection of 350. He was the first ever Romanian billionaire.