Kenneth Robert ("Ken") Rosewall AM MBE (Sydney, Australia, 2 November 1934) is a former world top-ranking amateur and professional tennis player who won Grand Slam singles titles in Australia, the United States, and France. He is considered to be one of the top male tennis players of all time. He had a renowned backhand and enjoyed a long career at the highest levels from the early 1950s to the early 1970s. He was one of the two best male players for about nine years and was the World No. 1 player for a number of years in the early 1960s. He was ranked among the top 20 players, amateur or professional, every year from 1952 through 1977.
Rosewall was born in Sydney, Australia, into a family that played tennis and owned tennis courts. A natural left-hander, he was taught by his father to play right-handed. Perhaps as a result of this unorthodox training (or in spite of it), he developed a powerful and effective backhand but never had anything more than an accurate but relatively soft serve. He was 1.70 m tall (5 ft 7 in) and weighed 67 kg (145 pounds) and was ironically nicknamed "Muscles" by his fellow-players because of his lack of them. He was, however, fast, agile, and tireless, with a deadly volley. His sliced backhand was his strongest shot, and, along with the very different backhand of former player Don Budge, has generally been considered one of the best, if not the best, backhands of all time.
The father of Brett and Glenn Rosewall, and grandfather of five, Rosewall now lives in northern Sydney, where he still frequently plays tennis.