Ilie “Nasty” Năstase (born July 19, 1946) is a Romanian former world No. 1 professional tennis player, one of the world’s top players of the 1970s.
Năstase was ranked world No. 1 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 (58 singles and 45 in doubles).
Năstase 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 seven 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 40 years. He is the second male player to win a Grand Slam event without dropping a set and the first one to achieve this feat at the French Open (1973).