Donald Dell is an American sports attorney, writer, commentator, and former tennis player. Dell was the first sports agent in professional tennis, and represented Arthur Ashe, Stan Smith, Jimmy Connors, and Ivan Lendl during the golden age of pro tennis (1975 to 1985). He was also the founder of Professional Services (ProServ), one of the nation's first sports marketing firms established in 1970.Dell is considered one of the fathers of sports marketing and the sports agent business along with IMG's Mark McCormack. Dell co-founded the Association of Tennis Professionals(ATP) in 1972 with Jack Kramer and Cliff Drysdale.He played on the United States Davis Cup team in 1961 and 1963 and was the captain of the winning Cup teams of 1968 and 1969, both undefeated.