5 Tennis Superstars who have quitted at the top of their game
Martina Hingis-

She is a former Swiss professional tennis player. Hingis is the first Swiss player, male or female, to win a major title and attain a world No. 1 ranking. She spent a total of 209 weeks as the singles world No. 1 and 90 weeks as doubles world No. 1, holding both No. 1 rankings simultaneously for 29 weeks.
She won five major singles titles, 13 major women’s doubles titles, and seven major mixed doubles titles, for a combined total of 25 major titles. In addition, she won the season-ending WTA Finals twice in singles and thrice in doubles, an Olympic silver medal in doubles, and a record 17 Tier I singles titles. Hingis was an all-court player who possessed an intelligent, crafty game. Hingis compensated for her lack of power with superior movement, anticipation, finesse, point construction, shot selection, and knowledge of the geometry of the court.