![Roger Federer en route to victory.](/web/20170207162236im_/http://www.smh.com.au/content/dam/images/g/u/1/1/9/y/image.related.landscape.460x307.gu11za.png/1485723509946.jpg)
Medical time-out was within the rules, says Federer
On top of the enormity of winning his 18th grand slam in his first major tournament after an injury lay-off, Roger Federer had to overcome a thigh injury that plagued him for most of his memorable Australian Open campaign.