Meaning to reply to this for ages.
Anyway I don't see Tracy's burnout the same. Austins came down to not recovering from injuries but still playing, probably a lack of sports injury knowkedge at the time. Growing up on the pounding hardcourts didn't help Tracy. Jaegar is a mixture of injuries, too much sucess at such a young age, not getting the right advice to manage injuries and her father!!!!
Hingis was purley psychological. She was told from when she was young she going to be the best and that's all she knew. So as soon as some losses came and she couldn't straighten things out, she moved into denial stage. Two critical losses, Jen at the Oz Open and Steffi at the French had her saying things like 'I was the better player' or 'I did win the match' even when she didn't reach the finishing line.
It's like she couldn't accept that she wasn't the best anymore and therefore had to get out.
There's more to life than just being happy.