MELBOURNE, Australia — Serena Williams' dominating run at the majors is over. American teenager Sloane Stephens is headed to the semifinals of the Australian Open.

Victoria Azarenka of Belarus walks off the court to take a medical time out during her semifinal match against Sloane Stephens of the US at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 24, 2013. (AP Photo/Dita

When asked about reaching her first Grand Slam semifinal, the new future face of tennis, Sloane Stephens, said with that beautiful smile, "Whoa, it wasn't as hard as I thought." The new future face of tennis. Yes, that, among other things, is who

Victoria Azarenka of Belarus walks off the court to take a medical time out during her semifinal match against Sloane Stephens of the US at the Australian Open tennis championship in Melbourne, Australia, Thursday, Jan. 24, 2013. (AP Photo/Dita

Sloane Stephens, a 19-year-old American who has the eyes to be a champion and the stamina to live up to it, was paired against Serena Williams, possibly the best American women's tennis player to ever hit a yellow ball on a court that has seen five