Age is just a number, but does that number affect results? Martina Hingis was only 16-years-old in 1997 when she won the U.S. Open, and just two years later, Serena Williams took home the title at the young age of seventeen. After 15-year-old CiCi Bellis' win over No. 12 seed Dominika Cibulkova on the second day of the tournament and an upset over No. 6 seed Angelique Kerber by 17-year-old Swiss player Belinda Bencic on Friday, there's no denying that a players' number of years (or rather the lack of) has become the talk of the tournament. On the men's side at the U.S. Open, it seems as though maturity triumphs the younger generation, and for the women, the champion's age has been steadily increasing since 2006. But the results are also different for the other Grand Slam tournaments. Will this be the year that youth prevails at the U.S. Open?