Serena Williams has served, volleyed and aced her way to an impressive athletic achievement.

The tennis star has been named 2015 Sportsperson of the Year by Sports Illustrated, becoming the first sole female recipient of this honor since Mary Decker in 1983.

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One of the greatest upsets in sports history took place at the U.S. Open in New York City on Friday afternoon.

Roberta Vinci, the 43rd ranked player in the world and a 300-1 long shot, defeated Serena Williams in three sets, ending the star's bid to win the first calendar Grand Slam in women's tennis since 1988.

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Later today, Serena Williams will square off against her older sister, Venus Williams, in a US Open quarterfinal match.

It'll be the 27th time that the sisters have played against one another, but this time, there's more at stake than ever before.

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