John Donald (“Don” or “Donnie”) Budge (June 13, 1915 – January 26, 2000) was an American tennis champion who was a World No. 1 player for five years, first as an amateur and then as a professional. He is most famous as the first man to win in a single year the four tournaments that comprise the Grand Slam of tennis. Budge was considered to have the best backhand in the history of tennis, at least until the emergence of Ken Rosewall in the 1950s and 1960s.