Stan Wawrinka pulls off big win against Daniil Medvedev.
Tennis mourns loss of NBA star.
Austrian maintains impressive form.
Swiss star expecting a tough match.
Aussie liked to Stan Wawrinka.
New nightmare for Delpo.
Roger Federer into Australian Open quarter-final.
Novak Djokovic rolls on at Melbourne Park.
Milos Raonic can do no wrong at the Australian Open.
The next few days could be the making of Sacha Zverev.