 "Adelaide International: Former Australian Open-winner Angelique Kerber retires from match with lower back injury")
Adelaide: Former Australian Open champion Angelique Kerber sustained a lower back injury and retired from her Adelaide International match on Wednesday. [caption id=“attachment_6937121” align=“alignleft” width=“380”]  File image of Angelique Kerber. Reuters[/caption] The former world No 1 trailed 6-2, 2-0 in her match against Dayana Yastremska when she stopped playing. Kerber, who won the Australian Open in 2016 and also has Wimbledon and US Open titles, had on-court medical help for the injury and then retired. Kerber lost in the first round to Sam Stosur last week at the Brisbane International. In other second-round women’s matches in Adelaide, Donna Vekic beat Maria Sakkari 2-6, 7-5, 6-1 and American Danielle Collins upset her seventh-seeded compatriot Sofia Kenin 6-3 6-1, to secure a quarter-final spot.
Kerber, who won the Australian Open in 2016 and also has Wimbledon and US Open titles, had on-court medical help for the injury and then retired
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