Updates from the quarter-finals at Melbourne ParkAshleigh Barty reaches maiden
Australian Open semi-finalAny thoughts? Email or tweet @JPHowcroft 5.39am GMT
![Australian Open day nine: Federer v Sandgren, Barty beats Kvitová – live!](https://i.guim.co.uk/img/media/8fbb3708c8f4f653df17da84cafc21773ecbf40d/0_46_3500_2101/master/3500.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom%2Cleft&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctbGl2ZS5wbmc&enable=upscale&s=51eee5dfdcde6c39d5f0f950a38734aa)
The medical time out is taken. It's an off court MTO for Roger Federer.#AO2020 | #AusOpen pic.twitter.com/U4QvCZdZ7Y 5.37am GMT
Here we go - the physio has been called and Federer departs RLA for an assessment. Tactical? The explanation for Roger’s poor play? TV comms speculate it might be a hip or groin issue if it’s something that can’t be worked at on-court to begin with. Federer has recent history of back issues, which could be at the heart of any short-term problems. Federer is calling the physio