Serena Williams' dominating run at the majors is over. American teenager Sloane Stephens is headed to the semifinals of the Australian Open. Williams hurt her back in the eighth game of the second set, hampering her serve. She had treatment and recovered well enough to give herself a shot at winning the match, but the 19-year-old Stephens kept her composure in a 3-6, 7-5, 6-4 victory on Wednesday.
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