As of 2012 , the only sports in which no professionals compete is boxing and wrestling , although even this requires a definition of amateurism based on fight rules rather than on payment , as some boxers and wrestlers receive cash prizes from their National Olympic Committees .
As of 2004 , the only sport in which no professionals compete is boxing , although even this requires a definition of amateurism based on fight rules rather than on payment , as some boxers receive cash prizes from their National Olympic Committees .