Ilie Nastase (Romanian pronunciation: , born July 19, 1946, in Bucharest, Romania) is a Romanian former professional tennis player, one of the world's top players of the 1970s. Năstase was the World No. 1 tennis player between 1973 (August 23) and 1974 (June 2). He is one of the five players in history to win more than 100 ATP professional titles (57 singles and 45 in doubles). He was inducted into the International Tennis Hall of Fame in 1991. Năstase won seven Grand Slam titles: two in singles, three in men's doubles, and two in mixed doubles. He also won four Masters Grand Prix year end championship titles and six Championship Series titles (1970–73) the precursors to the current Masters 1000. In 2005, Tennis magazine ranked him as the 28th-best player of the preceding forty years. He is the second male player to win a Grand Slam without dropping a set and the first one to achieve this feat at French Open (1973).
At the beginning of his career in 1966 Năstase travelled around the world competing with his good friend Ion Ţiriac. Together, they represented Romania in the Davis Cup competition, being three times runners up: in 1969, 1971 and 1972.
In singles, Năstase won his first tournament at Cannes on April 16, 1967. His first victories at top players happened in 1969 in Stockholm, where he defeated Tony Roche and Stan Smith.