MELBOURNE, Australia — Serena Williams' long winning streak came to an end in a stunning fourth-round defeat to Ana Ivanovic at the Australian Open on Sunday. Ivanovic hadn't won a set in her four previous matches against Williams, who had been a hot favorite to win a sixth Australian Open crown for her 18th Grand Slam title. Williams later admitted she'd been bothered by a back problem in practice in recent days and considered pulling out of the tournament.
Serena stunned in 4th round