![Roger Federer concentrates during his quarter-final match against fellow Swiss Stanislas Wawrinka.](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/LIOO4UBR635U3RNXXFFAUSOPR4.jpg?smart=true&auth=3d0ae779c116cbc4778df5bafdbbd8f8c43fd2f5e4846bc04a13efb5f1bb281c&width=400&height=225)
Roger Federer concentrates during his quarter-final match against fellow Swiss Stanislas Wawrinka.
Roger Federer concentrates during his quarter-final match against fellow Swiss Stanislas Wawrinka.
Roger Federer beats Stanislas Wawrinka to advance to semis
The word No 2 wins the all-Swiss quarter-final at the Australian Open and awaits either Tomas Berdych or Novak Djokovic.
Press Association
January 25, 2011