It is too young to retire but Ashleigh Barty who is world #1 in tennis has declared an early retirement. She said that she wants to enjoy her life and probably realized the drudgery of playing pro tennis. The tour is very punishing not only to the physical aspect but also to the mental health. Good luck to Barty and I hope the next top pro player would last longer than Barty. The world number 1 now is Poland's Iga Swiatek who is only 21 years old.