Conversation so far:
Who was Martina Hingis?
Hingis reached her fifth consecutive Australian Open final in 2001, defeating both of the Williams sisters en route, before losing to Jennifer Capriati.
How many games did she play?
During this segment of her tennis career, Hingis won 40 singles titles and 36 doubles events.
She held the World No.
1 singles ranking for a total of 209 weeks.

Question: When did she retire?
Self-contained rewrite: When did Martina Hingis retire from playing tennis?