![Photo: Serena Williams of the USA plays Kim Clijsters in the semi finals at the US Open Tennis Championships in New York - NYP20090912136 - UPI.com Photo: Serena Williams of the USA plays Kim Clijsters in the semi finals at the US Open Tennis Championships in New York - NYP20090912136 - UPI.com](https://cdnph.upi.com/pv/upi/6591080d5d12eea9ad3b4855372d9a3d/2009-US-OPEN.jpg)
Photo: Serena Williams of the USA plays Kim Clijsters in the semi finals at the US Open Tennis Championships in New York - NYP20090912136 - UPI.com
![Kim Clijsters, of Belgium, backhands the ball to Serena Williams, of the United States, during their match at the U.S. Open tennis tournament in New York, Saturday, Sept. 12, 2009. (AP Photo/Charles Kim Clijsters, of Belgium, backhands the ball to Serena Williams, of the United States, during their match at the U.S. Open tennis tournament in New York, Saturday, Sept. 12, 2009. (AP Photo/Charles](https://c8.alamy.com/comp/2P83B1Y/kim-clijsters-of-belgium-backhands-the-ball-to-serena-williams-of-the-united-states-during-their-match-at-the-us-open-tennis-tournament-in-new-york-saturday-sept-12-2009-ap-photocharles-krupa-2P83B1Y.jpg)
Kim Clijsters, of Belgium, backhands the ball to Serena Williams, of the United States, during their match at the U.S. Open tennis tournament in New York, Saturday, Sept. 12, 2009. (AP Photo/Charles
![First-seeded Justine Henin (R) of Belgium shakes hands with U.S. Serena Williams after winning her quarter finals match at the French Open in Roland Garros in Paris on June 5, 2007. Henin First-seeded Justine Henin (R) of Belgium shakes hands with U.S. Serena Williams after winning her quarter finals match at the French Open in Roland Garros in Paris on June 5, 2007. Henin](https://c8.alamy.com/comp/TYXY81/first-seeded-justine-henin-r-of-belgium-shakes-hands-with-us-serena-williams-after-winning-her-quarter-finals-match-at-the-french-open-in-roland-garros-in-paris-on-june-5-2007-henin-won-6-4-6-3-upi-photoeco-clement-TYXY81.jpg)
First-seeded Justine Henin (R) of Belgium shakes hands with U.S. Serena Williams after winning her quarter finals match at the French Open in Roland Garros in Paris on June 5, 2007. Henin
![Serena Williams of the USA argues with Donna Kelso and Tournament Director Jim Curley after being called for a foot fault at 0-30 in her match against Kim Clijsters of Belgium in Serena Williams of the USA argues with Donna Kelso and Tournament Director Jim Curley after being called for a foot fault at 0-30 in her match against Kim Clijsters of Belgium in](https://c8.alamy.com/comp/TYKCRE/serena-williams-of-the-usa-argues-with-donna-kelso-and-tournament-director-jim-curley-after-being-called-for-a-foot-fault-at-0-30-in-her-match-against-kim-clijsters-of-belgium-in-arthur-ashe-stadium-at-the-us-open-tennis-championships-at-the-billie-jean-king-national-tennis-center-in-new-york-on-september-12-2009-clijsters-defeated-williams-6-4-7-5-upijohn-angelillo-TYKCRE.jpg)