In 2006, Navratilova became the oldest-ever Grand Slam tournament champion when she won the United States Open (U.S. Open) mixed doubles title. At that time she was just over a month away from her 50th birthday (October 18). Her partner, Bob Bryan, was born in 1978, four years after she won her first Slam title. https://en.wikipedia.org/wiki/List_of_Open_Era_tennis_records
Serena Williams is the oldest ladies' singles champion with her recent French Open win at the age of 33 and 9 months. She beats the 25 year record held by Martina Navratilova, who won the 1990 Wimbledon title at 33 and 8 months.
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