Andy Murray came storming back after a poor start to beat Tomas Berdych and reach his fourth Australian Open final.
The British number one lost a tense first set but recovered to win 6-7 (6-8) 6-0 6-3 7-5.
It will be the sixth seed’s eighth Grand Slam final and first working with Amelie Mauresmo, with ex-coach Dani Vallverdu now in Berdych’s corner.
Murray, 27, will play the winner of Friday’s semi-final between Novak Djokovic and Stan Wawrinka.
“There was a little bit of extra tension – it was a big match,” said Murray. “A lot was made about Dani Vallverdu, my former coach, working with Tomas.
“But we’ve been friends since we were 15 years old and I felt that the focus was unfair and unnecessary.
“This is sport – and there’s more to life than sport. It created a bit of extra tension but everyone calmed down after start of the match.”
The Scot’s hopes were under threat after losing a tension-filled opening set, but he turned it around with a brilliant lob early in the second and took control with seven straight games.
Berdych, 29, had started much the better and served for the set at 5-3, only for Murray to break straight back in a rally of huge forehands and celebrate wildly in the direction of the Czech’s player box.
There was a definite edge to the contest, and some sharp words followed from Murray in the next game when Berdych complained about the balls.
Two more break points slipped by at 5-5 but Murray edged ahead in the tiebreak, earning the first set point, only for Berdych to save it impressively behind his serve and go on to clinch it.