John Virgo
1979 UK Championship winner on BBC One

What a turnaround that was. A great clearance from Judd Trump! At this level that's what you expect.

John Higgins rattles off a break of 62, but misses a fairly straightforward red into the corner pocket to leave 59 on the table with Judd Trump 56 points behind.

Higgins taps his cue on to the ground in frustration.

The world number is off his seat as quick as a flash and his positional play is absolutely spot on as he returns to the table and steals the frame with a flawless clearance.

Trump is now just one frame away from the Masters final.

Stephen Hendry
Seven-time world champion on BBC One

When he has needed to make a clearance like that John Higgins has done it five or six times this week. Judd Trump flicked a switch when he needed and so has John. Higgins had the luck earlier in the frame, but there was no luck about the clearance.

John Parrott
1991 world champion on BBC One

John Higgins was aiming to rattle that key shot into the jaws of the pocket and leave the cue ball down the table, but to actually pot it and the way it went into the pocket was unbelievable. What incredible nerves to making clearances like that at the age of 50.

A break of 46 from Judd Trump but an awkward red in the middle pocket sees him inadvertently knock the blue into the top-left corner pocket.

Savvy safety from John Higgins allows him to wrestle his way back to the contest as he chases down Trump's haul total of 54.

The key moment comes when the Scot cuts one of the remaining reds into the bottom corner from a tricky position. Was it a fluke? Either way the Ally Pally crowd roar in appreciation.

With his tail up, Higgins completes a superb clearance. Trump sits stone faced in his chair.

Stephen Hendry
Seven-time world champion on BBC One

All of the Class of '92 still going will admit they have an easy miss in them and that's what cost John Higgins there with that red into the middle. However, you don't get to be world number one without knowing when to flick the switch and find a gear.

Judd Trump has been poor today but that clearance was magnificent. Just to know the situation and when to deliver a killer clearance.

Higgins has to get his composure back and put that miss behind him. He can't let it linger and leave a scar on the next few frames.

How costly will this prove for John Higgins?

The Scot reels off a break of 44 before he misses a red into the middle pocket which allows Judd Trump back to the table.

Higgins can only grimace and slump into his chair as he watches Trump steal the frame with a clinical display of potting as he puts together a fine break of 70.

Stephen Hendry
Seven-time world champion on BBC One

Judd Trump has only got himself to blame for throwing John Higgins a lifeline. It should be 4-0. Whatever John Higgins has done at the interval he's come out a different player. That was magnificent.

Hazel Irvine
Presenter on BBC One

The real John Higgins has arrived it would appear! That is the 21st century break of the Masters which overtakes last year's total.

Much more like it from John Higgins. That frame before the mid-session interval has quite clearly given him a whole bucket load of confidence

The 50-year-old Scot finally looks to have settled and is purposeful round the table as he compiles a break of 104 - by far and away the highest of the match.

There's some vintage Higgins in there - not least a long pot up the table to sink the final red before a bit of flamboyance on the blue.

Judd Trump had been 3-0 up but now leads by just a frame.

Stephen Hendry
Seven-time world champion on BBC One

It's a disappointing semi-final of the Masters so far. We've built it up and it's not been great. Judd Trump is 3-0 up and had some glaring misses. He should be dominating. However, that frame before the mid-session interval for John Higgines does set up the second half nicely.

John Parrott
1991 world champion on BBC One

Even when John Higgins was 5-3 down to Zhao Xintong you knew you couldn't count him out because he would stay there until the bitter end to try as hard as he can.

A fabulous green for John Higgins to get himself back in the hunt. It's so surprising Judd Trump has not pressed home the advantage.

A bit of a scrappy frame, but John Higgins is able to get himself on the board.

Judd Trump ekes out 41 points before Higgins finally starts to look something his fluent self with a break of 42 - his highest of the match so far.

The Scott misses a straightforward pot at the top of the table for the final red and a safety battle follows from which Trump emerges on top.

With the frame seemingly his for the taking, Trump misses a simple yellow and this time Higgins capitalises. The 50-year-old clears the remaining colours bar the black to haul himself into the contest at the mid-session interval.

Stephen Hendry
Seven-time world champion on BBC One

I don't think you really settle in a match until you have won a frame in one visit. Then you feel you are involved in the match. John Higgins has done none of that. He hasn't registered a break of any sort yet. It's all bits and pieces. There were a few good shots, and he has got some table time, but at the end of it he is 3-0 down.

John Higgins finally opens his account with a long red which should give him a confidence but there's too many errors in his safety play.

Judd Trump compiles a break of 60 but he fails to cut a red into the middle pocket which would have left Higgins needing snookers and it opens up the frame.

A scrappy safety battle ensues with the reds scattered before Higgins manages to find some pots. He leaves Trump with an awkward snooker, behind the black with just one red remaining, but the world number one gets his angles right.

Trump makes errors of his own in another cautious exchange but Higgins is unable to capitalise and then the Scot ends up conceding the frame.

Stephen Hendry
Seven-time world champion on BBC One

Towards the end of John Higgins' quarter-final against Zhao Xintong he started to weaken a little bit. He had two pieces of fortune which got him through. So far he's struggled a bit here.

RWR4: John Higgins not in a good spot here.

John Parrott
1991 world champion on BBC One

John Higgins looks uncomfortable. He's played more poor safeties in the opening two frames than in the entire tournament. It's very unlike him. Very unusual and he has not looked himself at all.