Pat Cash: "Janowicz is 22 and I guess he never thought he would get here. In the past this is the sort of age you would have expected players to break through at a Grand Slam like I did in 1987, but these days it tends to be a little bit later.
So far in this tournament, Murray has made 77% of his returns and this has enabled him to break serve 24 times. His game plan on return is simple and it is set up perfectly to deal with big servers such as Janowicz. Murray likes to give himself time when returning first serves, which he will hope will enable him to neutralise the Pole’s big weapon. However, he will look to be very aggressive on Janowicz’s second serve, taking it well inside the baseline. Janowicz’s second serve has been fallible so far, especially in his quarter-final, where he won only 36% of the points on it.
"For somebody who has got that much power, at 6ft 8in with a monster of a serve, a big forehand and decent movement, he is always going to be a danger.
"He has beaten Murray convincingly before. Murray may have been a little bit off and thinking about the ATP World Tour finals a week later, but a win is a win and it will be at the back of Murray's mind."
Mats Wilander: "I expect Murray to come out and play a real tennis match, open up his shoulders and hit out. I thought he was too passive against Fernando Verdasco.
"He knows Janowicz leads the head-to-head and will be unafraid. He has a big serve, a big game and this is not the only time he is going to make the semis at Wimbledon. Murray has to step it up - a lot - and I expect him to do that, but it's going to be a tricky one.
"Experience will be the biggest factor. Murray is physically really, really strong and very quick. He is strong in the corners and returns well. As long as he gets the ball back in play from Janowicz's huge serve, it's going to take another blow by Janowicz to do something with it.
"By the time Murray has hit three shots, he has neutralised the power and we are then on an even playing field. Murray will show he is a little bit too good.
The numbers Janowicz has posted with his first serve throughout the tournament have been phenomenal. He has hit 94 aces, made 65% of his first serves and won 84% of those points. This graphic illustrates where his first serves landed in his win over Kubot. The combination of pace (he hit one serve at 140mph) and variation meant that 70% of his first serves did not come back into play.
"Although I think Murray could win in three sets, a couple will probably go to tie-break. But in the long run, Murray is a marathon runner, Janowicz a sprinter and the marathon runner is likely to prevail."
Jonas Bjorkman: "Wednesday was the best performance I've ever seen from Murray without playing his best tennis. He showed some great character, he worked hard to find his game and I was massively impressed. He got the crowd going and in the end managed to come up with some big plays to win the match.
"Janowicz has the biggest serve in tennis right now; he hit 30 aces in the quarter-finals. He's had a day to adjust to what he's achieved, but it's going to be interesting to see how he handles all the attention because it's completely different.
"I watched him warming up on Court 15 on Wednesday and there were maybe 10 people watching. That quadrupled on Thursday, it will be even more on Friday and a lot will depend on the mental approach he takes into the match.
"Andy is a great returner and he's going to make Janowicz play a lot. Once he gets the ball in you've got to favour Andy, but he can't be too defensive because Janowicz moves well for a big guy and has got big weapons.
"Andy needs to make sure he steps in and takes control of the rallies. With the crowd on his side, I think Andy will come through in four sets."
From the beeb.
Can someone have a word with Mats and refresh his memory on the H2H or perhaps I should send him a link to my graphic