Ouch!published at 52 mins
Hearts 2-1 St Mirren
Scott Tanser's game is over as he pulls up with a muscle injury.
Marcus Fraser is on to replace.
Hearts the first team through to Scottish Cup semi-finals
Baningime lashes in rebound after Alnwick saves from Simms at close range; Haring converts Woodburn cross to double lead
Brophy gives St Mirren a lifeline with first-time finish into top corner; Ronan equalises with stunning, swerving 30-yard strike
Substitute McEneff nudges Hearts back in front with first touch and Simms adds late fourth with front-post strike
Nick McPheat
Hearts 2-1 St Mirren
Scott Tanser's game is over as he pulls up with a muscle injury.
Marcus Fraser is on to replace.
Hearts 2-1 St Mirren
Leanne Crichton
Ex-Scotland international on BBC Scotland
Quote MessageWhen you've had a two-goal advantage, you always feel like you're chasing that third goal - you want that cushion... but St Mirren have certainly started the second half the way they finished the first.
Hearts 2-1 St Mirren
Wonderful double save up the other end as Nathaniel Atkinson forces Jak Alnwick across to his right.
Ben Woodburn then bursts forward and sees a strike deflect towards goal.
Alnwick is pretty much diving the other way but reacts brilliantly to throw an arm at it.
Hearts 2-1 St Mirren
St Mirren keep probing as Connor Ronan's cross finds Eamonn Brophy again.
He's got more space than he thinks and his attempted header comes off the shoulder and Craig Gordon gathers.
Hearts 2-1 St Mirren
Greg Kiltie's ball from the byeline makes its way to Eamonn Brophy.
The striker is trying to make room for a short but Hearts defend well.
Hearts 2-1 St Mirren
Hearts 2-1 St Mirren
The players are back out and referee Bobby Madden gets the second half under way.
More of the same, please.
HT: Hearts 2-1 St Mirren
Allan Preston
Ex-Hearts defender on BBC Sportsound
Quote MessageHearts have been the better side for long periods of that half. Boyce has been instrumental in everything that they've done. Simms has done well, he's frightening Shaughnessy and Dunne.
HT: Hearts 2-1 St Mirren
Jack Ross
Former St Mirren manager on BBC Scotland
Quote MessageThe pendulum swung plenty of times. Hearts' front four have been really good, affected the game really positively. The dynamics changed with St Mirren's goal. Their energy levels went up again.
HT: Hearts 2-1 St Mirren
Shelley Kerr
Former Scotland head coach on BBC Scotland
Quote MessageIt's certainly been action packed. In the initial stages of the game, I thought Barrie McKay caused St Mirren huge problems out on the touchline. Liam Boyce took up good deep positions and it affected St Mirren's midfield.
The game has lived up the occasion. A cracking half of cup football.
Close-range finishes from Beni Baningime and Peter Haring had Hearts two up, but St Mirren have impressed and more than merited a goal when Eamonn Brophy pulled one back.
A proper end-to-end tie.
Hearts 2-1 St Mirren
Not far away from Stephen Kingsley, who lines one up from range.
His low, driving strike goals about a yard wide of the far post. Unlucky.
Hearts 2-1 St Mirren
Jordan Jones, who has been excellent by the way, looks like he's got an opening on the break.
But the ex-Killie winger slips at a vital moment to ironic cheers from the home fans.
Hearts 2-1 St Mirren
There are more goals in this. Almost feel certain of it.
Hearts 2-1 St Mirren
What a crazy passage of play.
Liam Boyce's acrobatic finish from Peter Haring's header across goal is blocked at close range.
Craig Halkett picks the ball up and smashes one from close range, but it smashes off the bar and St Mirren somehow survive.
What a game!
Hearts 2-1 St Mirren
Stephen McGinn
Former St Mirren midfielder on BBC Sportsound
Quote MessageAndy Halliday has got to be stronger. Richard Tait gets too much space on the right. Brophy's still got so much to do - but that's why he's a top striker at this level, he almost made it look easy.
Hearts 2-1 St Mirren
Eh, St Mirren should probably have a second.
A deep free-kick from Jordan Jones finds Eamonn Brophy with space, but his glancing header is easy enough for Craig Gordon.
Eamonn Brophy
I did say is wasn't over...
It's another excellent goal as Richard Tait's inch-perfect ball from the right is clipped beautifully by Eamonn Brophy high into the far corner.
Brilliant ball. Even better finish. Game on!
Hearts 2-0 St Mirren
You know, St Mirren have already played pretty well, but they aren't clinical enough and Hearts are doing them on the counter.
This isn't over yet.
Hearts 2-0 St Mirren
Leanne Crichton
Ex-Scotland international on BBC Sportscene
Quote MessageIt's absolute quality. Ruthless in the final third. Ellis Simms does really well initially, Boyce sees the pass early and the finish from Peter Haring - it's not as easy as he makes it look. That support play from Hearts, they've executed it perfectly.