Conversation so far:
Who was Martina Hingis?
Martina Hingis is a Swiss former professional tennis player.
How many career games did Martina Hingis play?
When did Martina Hingis retire?
She retired in November 2007 after being hampered by a hip injury for several months.
Was Martina Hingis injured often?
Martina Hingis had a right ankle surgery in October of 2001, and a left ankle surgery in May of 2002. After that she struggled with injuries.

Question: Did she come back from retirement?
Self-contained rewrite: Did Martina Hingis come back from her 2007 retirement?