Title favourite Serena Williams made a shock exit at the Australian Open as injury derailed her hopes against Sloane Stephens in the quarter-finals.
The 15-time Grand Slam champion led her fellow American by a set and a break, but after being treated for a back spasm in the second set went down 3-6 7-5 6-4.
Williams was heard on court to say it had been the "worst two weeks" as she has struggled with ankle and back issues, and afterwards she stuck by that assessment.
"For a Grand Slam, absolutely. Absolutely," she said.
