Martina Navratilova won 18 Grand Slam singles titles.
MARTINA NAVRATILOVA, WOMEN'S TENNIS
1984 (Lost to Helena Sukova)
You know a streak's good when it has a Wikipedia page dedicated to it. Starting at the U.S. Indoor Championships and ending in the semifinals of the Australian Open, Navratilova was unbeatable. Her reign of dominance in women's tennis spanned from the mid-1970s until the late-1980s.
Tennis great Martina Navratilova, center left, and United States Tennis Association President Lucy Garvin, center, right, ring the opening bell of the New York Stock Exchange remotely from the Billie Jean King USTA National Tennis Center in New York, joined by wheelchair tennis champion Esther Vergeer, left, NYSE Euronext Senior Vice-President John Merrell, second left, USTA member Dori Samadrai-Bonner, second right, and ball person Laray Fowler on the first day of the U.S. Open tennis tournament, Monday, Aug. 30, 2010. (AP Photo/Paul J. Bereswill)
Tennis player Martina Navratilova attends the premiere of ESPN Films' documentary "Unmatched" at Tribeca Cinemas on (Aug. 26, 2010)
FILE - This June 27, 2009, file photo shows nine-time women's singles Wimbledon champion Martina Navratilova waving from the Royal box on centre court prior to a third round singles match between Venus Williams and Carla Suarez Navarro, at Wimbledon. A report says tennis great Martina Navratilova has been diagnosed with breast cancer and that her prognosis is said to be excellent. People magazine's Web site posted a story Wednesday, April 7, 2010, quoting Navratilova saying "I cried" after being informed of the diagnosis following a routine mammogram.(AP Photo/Kirsty Wigglesworth, File)