Martina Navratilova was a legendary tennis player who dominated the sport in the 1980s. Her main rivals were Steffi Graf, Chris Evert, and Monica Seles. Graf was a German tennis player who won 22 Grand Slam singles titles and is considered one of the greatest female players of all time. Evert was an American tennis player who won 18 Grand Slam singles championships and was known for her powerful groundstrokes and consistent play. Seles was a Yugoslavian-American tennis player who won nine Grand Slam singles titles and was known for her aggressive style of play. All three of these players were formidable opponents to Navratilova during her career.