Calendar Grand Slams Are Really, Really Rare
It's not easy to win tennis' Australian Open, French Open, U.S. Open and Wimbledon. In fact, only four women have done it.By Katie Link | September 9, 2015
Serena Williams looks unstoppable.
She's taken home the trophy from the 2015 Australian Open, the French Open and Wimbledon. Now, Williams is only two wins away from taking the title at the U.S. Open — and a Grand Slam sweep.
Only three women have swept the Grand Slam singles tournaments in the same calendar year — Maureen Connolly, Margaret Court and Steffi Graf.