Angelique Kerber has suffered an injury scare just days before the Australian Open after being forced to withdraw from the Adelaide International with a back injury.

The world No 18 was 6-3 2-0 down to Dayana Yastremska when she retired from their round-of-16 match.

Queens of MelbourneCoco counting down the days

Kerber had earlier called for a medical timeout so a trainer could work on her lower back.

Kerber received treatment on her back during her match against Dayana Yastremska but was unable to continue Kerber received treatment on her back during her match against Dayana Yastremska but was unable to continue Kerber received treatment on her back during her match against Dayana Yastremska but was unable to continue

There was no immediate news as to whether the 31-year-old German’s injury will prevent her from taking part in the Australian Open, which she won in 2016.