5 of the best WTA World No. 1s

#2 Martina Navratilova

Navratilova played professional Tennis for a whopping 32 years, retiring at the age of 50!

Some of Martina Navratilova's records are simply unbreakable. In my humble opinion, no player, male or female, will ever break her record of 167 singles titles (including 18 Grand Slams) and 177 doubles titles (including 41 Grand Slams). Whilst some of the most accomplished players aim for ending up with 5 or 10, she won, in all, 59 Grand Slams! 31 of those were women's doubles titles, another record. If I were a betting person, those are the records I'd bet would never be broken.

Martina reached the finals of 11 consecutive Grand Slams, a record at the time and only bettered by Steffi Graf. She and Serena Williams (next) are the only players to have won six Grand Slams without dropping a set. She won the Wimbledon singles a record nine times. Half of her Grand Slam singles titles came at the famous venue.

The southpaw was known for her serve and volley. She could make her opponents run from side to side with ease, thus making them work for every point. She revolutionised the fitness regime of Tennis players and that enabled her to continue playing until the age of 50.