Knowles played singles and doubles for the Bahamas Davis Cup team for more than 13 years and he is a five-time Olympian, reaching the quarterfinals at the ATP and was selected to be on the ATP Drug Force Council.
Knowles played singles and doubles for the Bahamas Davis Cup team for more than 13 years and he is a five-time Olympian, reaching the quarterfinals at the 2000 Summer Olympics in Sydney. Knowles was elected (by his peers) as Vice President of the ATP and was selected to be on the ATP Drug Force Council.