#3 Ken Rosewall holds the record for both the oldest and youngest man to win the Australian Open
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Ken Rosewall is considered to be one of the greatest tennis players of all-time and had a pretty long career that lasted more than two decades. In his career, Rosewall won a total of eight Grand Slams, four of which were Australian Open titles. These four titles were won in 1953, 1955, 1971, and 1972.
Rosewall holds the record of being the oldest as well as the youngest man to win the Australian Open title. He became the youngest winner of the competition in 1953 at 18 years and two months when he defeated compatriot Mervyn Rose in straight sets to win the first Grand Slam title of his career.
Coincidentally, Rosewall became the oldest champion of the tournament at 37 years and two months when he won the last Grand Slam title of his career. Once again he defeated a compatriot in the final in straight sets, this time Mal Anderson.
