there should be several lists, generate some controversial discussions, just for the fun of it
1. 50 greatest based upon popularity of the sport. (not the popularity of the athletes! They still have to win.) So softball, golf etc will be excluded. You cannot deny the influence of a sport on the population while trying to glorify some athletes in other obscure events.
2. 50 greatest based upon their winning record. (all those tennis, basketball greats...
3. 5o greatest based upon the longevity of their wining sports lives.
4. 50 greatest world record holder.
5. 50 greatest who can hold against men! Kim Rhode can probably compete with men at Olympic. Serena might be able to, but can she be ranked in top ten on the men's side, probably not. Judit Polgar ranked as high as 8th amongst men, and always represents her country on men's side for chess Olympiad. Chinese Skeet shooter Zhang Shan won in 1992 Olympic but could not defend her title as the event was only open to men in 1996!
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10.50 based upon their looks. (I don't think Diggins is a top 50 looker amongst all female athletes ..)