23 January 2013 Last updated at 21:03

Australian Open 2013: Roger Federer knows Andy Murray's game

Roger Federer believes his recent experiences of playing Andy Murray will help when they meet in their night-time Australian Open semi-final on Friday.

The Swiss was taken to five sets by Jo-Wilfried Tsonga but prevailed 7-6 (7-4) 4-6 7-6 (7-4) 3-6 6-3 while Murray swiftly beat Frenchman Jeremy Chardy 6-4 6-1 6-2 to make the final four.

Federer says the Scot is playing "more offensive" tennis since winning the US Open and Olympic gold, and expects a "tough" clash in Melbourne.