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American teenager Sloane Stephens stunned Serena Williams on Wednesday, January 23, beating the 15-time grand slam winner 3-6, 7-5, 6-4 to reach the Australian Open semifinals. It was an unlikely victory for the 19-year-old tennis pro. WILLIAM WEST/AFP/Getty Images
Williams congratulates Stephens at the end of their match on Wednesday. Cameron Spencer/Getty Images
Playing in her first Grand Slam quarterfinal, Stephens came from one set down Wednesday to overcome third seed Williams, who suffered a back injury after having already rolled an ankle earlier in the tournament. Lucas Dawson/Getty Images
Stephens walks off the court Wednesday after winning her quarterfinal match against Williams at the Australian Open. Michael Dodge/Getty Images
Stephens serves to Sara Errani of Italy during the Sony Ericsson Open in Key Biscayne, Florida, on March 22, 2012. Matthew Stockman/Getty Images
Stephens gets ready to serve to former world No. 1 Ana Ivanovic of Serbia during their third-round match in the U.S. Open in New York on September 3, 2011. Stephens lost 6-7, 6-4, 6-2. EMMANUEL DUNAND/AFP/Getty Images
Stephens returns a shot against Reka-Luca Jani of Hungary on the second day of the 2011 U.S. Open. Stephens outlasted Jani for a 6-2, 3-6, 7-6 (3) victory, her first win in a major tournament. It earned her a spot as the youngest player in the Women's Tennis Association's top 100. Chris Trotman/Getty Images
At the Sony Ericsson Open in 2011, Stephens signs an autograph for a young fan. Mike Ehrmann/Getty Images
During her junior career, Stephens picked up a doubles title at Wimbledon in London on July 4, 2010, with Hungarian teenager Timea Babos. Matthew Stockman/Getty Images
