Well, it could be boxing, athletics, swimming, tennis, martial arts, football, basketball, or any other sport. Irrespective of the sport he or she is involved in, in your opinion, who is the greatest achiever? Who has achieved most in the sport that he/she is participating in or has participated in?
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Lance would be a good candidate regardless. The man beat cancer. Whether he was doping or not, his feats were still impressive and probably wont be surpassed.