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Trump's Conflicts of Interest
Featured Series: Trump's Conflicts of Interest
Donald Trump's international web of businesses creates unprecedented potential for conflicts of interest and corruption. And some picks for his administration might have to face their own...

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.

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.

Maureen Connolly did it in 1953. The California native was only 18 years old. A horseback riding accident the next year forced her into early retirement. (Video via Netherlands Institute for Sound and Vision)

Then there's Margaret Court. The Australian won her title in 1970 at age 28. She's also the only player in the world, male or female, to win the Grand Slam in singles and doubles.

German Steffi Graf took home the title in 1988. She was 19 at the time. She took the title one step further and won gold at the Summer Olympics. Media dubbed it the "Golden Slam."

This video includes images from Getty Images and Materialscientist / CC BY SA 3.0 NL

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