Postpublished at 75 mins
Leigh 12-6 St Helens
Agnatius Paasi puts his body on the line as he tries to break through on the last tackle for St Helens but he's in some pain in the aftermath.
Leigh are defending so well right now but can they hold on?
FT: Leigh 12-10 St Helens
Leigh beat St Helens to reach first Challenge Cup final since 1971
Lussick try gives St Helens 6-0 lead at the break
Leigh hit back to lead with tries from Holmes & Hardaker
Lomax scores late try to give Saints hope but Makinson misses conversion
Jay Freeman
Leigh 12-6 St Helens
Agnatius Paasi puts his body on the line as he tries to break through on the last tackle for St Helens but he's in some pain in the aftermath.
Leigh are defending so well right now but can they hold on?
Leigh 12-6 St Helens
St Helens are back up to full strength as Sione Mata'utia returns from the sin bin.
Jonny Lomax looks to atone for his earlier error as he's sent through right in front of the sticks but he's held up and Leigh eventually win the ball back on the turnover.
Leigh 12-6 St Helens
Tommy Makinson tries to twist and turn his way over the line but Leigh hold him up again in the corner.
St Helens don't have long left to turn this bright spell into points, but Jonny Lomax drops the ball as another attack starts.
Leigh 12-6 St Helens
John Kear
Wales coach on BBC One
A great defensive effort by Leigh. Josh Charnley and Lachlan Lam were both in there. That's the desperation that the Challenge Cup brings out in you.
Leigh 12-6 St Helens
St Helens are hammering Leigh now, with Josh Charnley rushing to punt the ball in to touch to concede a goal-line drop-out.
Saints have amassed this momentum with 12 players, too.
They've got less than two minutes now until Sione Mata'utia is back from the sin bin.
Leigh 12-6 St Helens
It's not given.
None of the available replays showed Konrad Hurrell grounding the ball.
Make of that what you will.
Leigh 12-6 St Helens
Konrad Hurrell is over for St Helens.
It's given as no try on the field as a crowd of Leigh bodies race to deny him.
It's sent upstairs.
Leigh 12-6 St Helens
Kevin Brown
Former England international half-back on BBC One
Leigh will know St Helens are there for the taking. They are not as dominant as they have been in previous years.
Sione Mata'utia just got it wrong there. He was too high and too late. It was an easy decision for the referee to make.
You can't put a value on the resilience Leigh have shown when they were under the cosh. And now they have an extra man.
Leigh 12-6 St Helens
It's going from worse to even worse for St Helens.
Alex Walmsley is limping around the field after struggling from a tackle just past halfway.
Ben Reynolds
Following that Sione Mata'utia late tackle, Leigh also win a penalty for their troubles.
Ben Reynolds, who's cleared to play on after the tackle, just about kicks the extra two.
Leigh are a converted try ahead of St Helens with less than 20 minutes remaining.
Leigh 10-6 St Helens
There's a pretty late tackle from Sione Mata'utia as the St Helens man closes down Ben Reynolds.
Replays show it's pretty late indeed and he's sent to the bin.
It's getting worse for Saints.
Leigh 10-6 St Helens
St Helens try a swift counter attack but run out of tackles leading Sione Mata'utia to kick to goal.
No one quite has the pace to run onto it and Leigh start on zero tackle as the game restarts.
It's not quite falling into place for St Helens right now.
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Tracy Pick: Wow! What a try! Leigh have woken up.
Reece Duddle: Saints to score again, kick the goal and win it and break Leigh hearts.
Leigh 10-6 St Helens
John Kear
Wales coach on BBC One
That was a masterclass of a set of six for Leigh.
Lachlan Lam brought the opposition defence up and weighted a perfect kick. It was absolute quality because he was under pressure.
The character and determination is really shining through for Leigh Leopards.
Leigh 10-6 St Helens
If you're St Helens, do you panic? How have they let this tie slip from their grasp?
We've got a thumping 25 minutes left in this Challenge Cup semi-final, I bet.
Zak Hardaker
Could this be the moment that tips this Challenge Cup semi-final in Leigh's favour and gives them the momentum to see out this tie?
There's a frantic last-ditch kick on the turnover in to the corner and Tee Ritson races in to try and kick the ball dead before Leigh can get onto it.
But an unopposed Zak Hardaker races in and touches down after Ritson slides into touch.
Ben Reynolds misses the kick. Four points in it.
Leigh 6-6 St Helens
Kevin Brown
Former England international half-back on BBC One
Adrian Lam has got this Leigh team doing what they are good at, offloading and really hammering this left side.
They are playing with energy - they have found their energy.
Leigh 6-6 St Helens
The game, whether temporarily or otherwise, has calmed down just a little bit after a frantic few minutes after the restart.
St Helens work a few set of passes and look for a counter attack but Tommy Makinson slips from Jack Welsby's offload before he can run in at the corner just before the turnover.
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Stuart: Brilliant game of rugby league.
Leigh 6-6 St Helens
Leigh are throwing everything at St Helens right now and it's Saints who are scrambling to deny them.
It's the polar opposite to the first half right now. Edwin Ipape gets to within about an inch of the line but he's held up.
Saints are on the ropes.