Britain's Andy Murray plays Canada's Milos Raonic on Friday for a place in Sunday's Australian Open final.
Four-time runner-up Murray is attempting to reach his fifth final in Melbourne, where Novak Djokovic awaits.
Big-serving Raonic, the 13th seed, is chasing a spot in his first Grand Slam final having seen off Frenchman Gael Monfils in the quarter-finals.
Murray, 28, and Raonic, 25, have played each other eight times on Tour, with honours even.
Full commentary on the match is available on BBC Radio 5 live sports extra from 08:30 GMT, with television highlights following on BBC Two at 14:00 GMT.