5 unbreakable records of Martina Navratilova

3. Highest winning percentage aggregated over 5 years

Serena Williams (left) and Martina Navratilova at the 2015 Miami Open

From 1982 to 1986, Martina Navratilova was the top-ranked Singles player. During this highly productive period, she won 12 of her 18 Grand Slam Singles titles including the Wimbledon Championships on 6 consecutive occasions -- an all-time record. In these 5 years, she had a winning record against all of her peers including fellow American greats like Chris Evert and Billie Jean King.

During this trophy-laden spell, Navratilova won a ridiculous 428 out of the 442 Singles matches that she played, averaging just under 3 losses per year to 87 wins. Her aggregated win percentage was 96.8 % .

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4. 20 years ranked inside the WTA Top-10

Martina Navratilova won her last Grand Slam just shy of her 50th birthday at the 2006 US Open Mixed Doubles

Such was Navratilova's consistency and form, that there has never been a phase in her professional tennis career that she looked out of sorts. Sustaining tennis at such a high level for over 3 decades is no mean feat. Many other female tennis athletes of the time retired either in their late 20's or early 30's. Few even dared to carry on playing past their mid 30's.

From 1975 until her Singles retirement in 1994, Navratilova was ranked inside the WTA Top-10 -- that is 20 years consecutively. In fact, 19 of those years she was ranked inside the Top-5.