Britain's Andy Murray will take on Roger Federer for a place in the Australian Open final on Friday. BBC Sport asked former Wimbledon champion Goran Ivanisevic to examine the match.
Murray and Federer have met 19 times since their first match in 2005, with the Briton winning 10 of them.
Ivanisevic: "I think they know everything about each other because they have played so many times.
"They had two very interesting matches within a couple of weeks last year, the final of Wimbledon and the final of the Olympic Games, on the same court.
"Murray just destroyed Federer in the Olympics. In the Wimbledon final, he had chances in the third set and then Federer destroyed him."
While Murray leads their overall head-to-head, Federer has a 3-0 record in Grand Slam meetings.
Ivanisevic: "Mentally, Andy is ready. It doesn't matter that it's 3-0. He has beaten him before, so he knows how to beat him. The Olympic Games and the winning a Grand Slam at the US Open helped him a lot. He doesn't have people putting pressure on him about when he's going to win his first Grand Slam."
Both men will be spend most of the match at the baseline, but Federer is the more naturally aggressive and Murray a counter-puncher.
Ivanisevic: "This year the court is playing a little bit faster here, which suits Federer a little bit more. But Murray has improved a lot, he's using his speed great and he's going for his shots, not just pushing it.
"Roger is Roger, he comes up with some shots they don't have in the book. I think it will be a very aggressive match. Roger is going to attack him a lot, Andy is a great defender, but he cannot defend all the time. He also needs to step in and go for it."
TOO EASY FOR MURRAY?
Federer needed five sets to beat Tsonga in the last eight, while Murray has made it through without losing a set.
Ivanisevic: "It doesn't matter. What does 'easy' mean? So you win in three sets, you still have to win. Those guys that Andy beat are not bad. Tsonga had a great match against Roger.
"You can play five sets every match and win, or you can come 'easy' into the semis and still lose. The semis is a different day, different match, and these two guys are both great players and will have another great match."
FRIGHT NIGHT FOR MURRAY?
Federer has played his last four matches in the night session, while Murray has been scheduled in the day throughout.
Ivanisevic: "Andy has played a lot of matches here at night. He played an unbelievable semi against Djokovic last year at night. It's cooler, it's better, it's easier to play at night. I think it can only help Andy."
THE LENDL INFLUENCE
Eight-time Grand Slam champion Ivan Lendl began coaching Murray last January, helping him win a first major at the US Open.
Ivanisevic: "I know Lendl well, we played a lot of times. He is an unbelievable guy and an unbelievable player. He's a funny character, he can talk a lot, and he's a champion. Lendl brought Andy that aggression to just go for it. You can't expect Federer or Djokovic to just miss the ball if you don't push them. Now he's running well, plus he's going for the shots."
Ivanisevic: "The good thing for Andy is they play in the semis. If they played in the final, I would say Roger, but I give a little, little more chance to Andy because it's the semi-final and not the final. I think Andy would like to beat Roger just to get that weight off his shoulder and say he beat Roger in a Grand Slam.
"This is a huge tournament, both of the guys are playing unbelievable tennis. They're both ready and it's going to be one or two points here or there that will decide who's going to win."
Goran Ivanisevic will be part of the 5 live commentary team for Murray v Federer from 08:30 GMT on Friday