Wait, Martina Hingis is winning Grand Slam tournaments in 2015?

I don't follow tennis with the same intensity that I used to, so I was absolutely baffled when I saw this tweet last night:

Comeback queen Martina Hingis won her fifth major doubles title of the year (by @SI_ENewman): http://t.co/WJK8xWQ7mC pic.twitter.com/ZtBmbhcCHm

— SI Tennis (@SI_Tennis) September 14, 2015

Um, what?  The same Martina Hingis who was the best female tennis player in the world in 1997?  I though she retired in 2002?  (She did.)  Then she came back, got as high as No. 6 in the rankings, and retired again in 2007.  And now, in 2015, Hingis won two Grand Slam doubles titles and three in mixed doubles, including both at the U.S. Open--17 years since the last time she won a doubles championship there?

How is that possible?


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