08:00TennisRoger Federer v Tomas Berdych: Australian OpenBBC Radio 5 Sports Extra Duration: 7 hours Wed 24th Jan 2018, 08:00 on BBC Radio 5 Sports ExtraLive tennis commentary on Roger Federer v Tomas Berdych from the quarter-finals of the Australian Open in Melbourne.GenresSportTennisSeriesTennis Source: BBC Online