Even with her loss in the U.S. Open semifinal, 2015 was the year of Serena Williams. She won four consecutive slams from the 2014 U.S. Open to this year's Wimbledon title.
And Saturday is Serena's day: One of the greatest players in tennis history will be turning 34 years old.
Serena has been in the public eye for about two decades now, so it makes sense that so many aspects of her life and career are very well known. But there are also things about the 21-time champ that aren't. Here are five things you might have not known about the now 34-year-old tennis superstar.