Louis Desmarteaux- That Louis Desmarteaux is Tennis Guy known for being ‘That Tennis Guy’. He is a professional in the USTA, the United States Tennis Association. Tennis is a sport that at its highest levels requires the development of innate instincts forged into skill over hours of all day practices over many years. He started out young, gained quick achievement as a junior tennis champion out of Canada, and has created the career he has today.