Chris Porter's headed goal was the difference over two legs. Thanks for looking in tonight.
It's all over, Sheffield United have a dramatic late win and they will go to the League One Play-Off final!
Weak shot from Mousinho, Simonsen gratefully flops on it.
Aerial bombardment but United have held firm.
Day hoofs it upfield as Stevenage throw everyone forward.
Three minutes are added on.
Reid for Byrom
United will look to wind the clock down from here, Porter heads for the corner but Stevenage get it back.
Stevenage threaten at a corner but Simonsen collects easily.
It felt like a goal was coming, after nearly three hours over both legs. Can United hold on?
Lowton chipped it in from the right and Porter rose to nod home from six yards out!
Goal! Porter for United!
Ambitious from Bostwick but he finds row Z from over 30 yards out.
It is all United as Quinn forces Day into action at his near post.
Hill hits a fine shot just wide of Day's left post, the Stevenage keeper was nowhere near that!
Lowton shoots with his left after cutting in from the right, but a Stevenage knee blocks the shot. Much better game now.
Bostwick drills a free kick low but straight at Simonsen from a long, long way out.
Lowton booked for a pull earlier in that move
Laird shoots and Simonsen makes a fine save!
Does not get over the first man and Stevenage clear.
Williamson forces a corner for the Blades.
Quinn outraged at not getting a throw in. It's just not dropping for United at the moment despite their pressure.
Williamson curls it a long way wide of Day's left post. Poor.
Free kick to United, 30 yards out after Bostwick and Porter clash.
United keeper Simonsen has has little to do since that save from Freeman.
Just get the feeling United are upping the ante - but still no real cutting edge.
Maguire chips it forward but Day collects easily.
Roberts blocks Porter but no booking - home fans boo that decision lustily. The defender knew what he was doing there.
Emma Conyers says Stevange will wait until the dying seconds and nick it 1-0.
Good defence from United, but there's no outlet when they do break.
Lowton's low cross is deflected into the arms of Day.
Freeman swings it in, but Porter clears.
Stevenage force a corner.
Beardsley replaces Agyemang for Stevenage.
Williamson finds Quinn but his left-footed shot from the edge of the box flies wide. The game is starting to open up nicely now.
Bostwick rampages forward but three red and white striped shirts hound him out of possession.
Steven Boote in Chicago says 3-2 to the Blades - very optimistic on current showing.
Freeman wriggles in from the left, gets on to his right but shoots straight at Simonsen - his first serious save of the night.
Stevenage have gone very quiet since the break, United having much more of it.
Mousinho replaces Shroot for Stevenage.
Flynn's rasping shot on the turn shapes just wide of the left post at the last second!
That was on to Williamson almost too soon, but was a decent chance.
Massed defence from Stevenage is frustrating United, then Williamson nips into the box but shoots a yard wide from close range!
Stevenage fan Louix Monk says his side will win if they hold out until 70 mins. Keep 'em coming.
Can Monty do it for us? Go aaan! - says Dan Bullock
United press but fail to cross it in - no pressure on the Stevenage keeper.
Flynn scuffed that - nerves?
Flynn shoots from inside the box but Wilson clears - the United player should have done better, he underhit that one.
Stevenage peg United back early on.
Montgomery replaces McDonald for United as we resume.
Ben Trup also reckons we might be on for a late night - he says 2-1 to Stevenage after extra time. Keep your thoughts coming in - and let me know where in the world you are.
Send me your thoughts to firstname.lastname@example.org. We could be in for a long night!
That's the break, 0-0. Both sides very nervous, and only that save from Day to deny Porter early on counts as a serious chance.
McDonald goes down and the game pauses - could be a hamstring problem, the physio is on. Only a few seconds to the break.
One minute of stoppage time to come.
Williamson lashes the ball high and wide from 25 yards. At least he had a go, but Day was not troubled.
Agyemang still dealing on scraps but he can't make anything of it down the right hand side.
United deal with the free kick and break, but a fine challenge from Ashton stops the threat.
Flynn flies in on Shroot clumsily and gives away a free kick.
Williamson looks like he might get a shot in but Bostwick uffs it out.
Agyemang slips just as he looks like he might get away; he's had little to go on since that chance in the first minute.
United have gone off the boil a little bit, but Simonsen has yet to make a meaningful save.
Another good block by Lowton; Stevenage having their best spell since the start.
Laird's low cross cleared by Lowton once again.
Agyeman feeds Laird but Lowton nips in to clear at a rare Stevenage attack.
Bostwick and Flynn collide just outside the box, the United player goes down but no free kick given.
Quinn tries to make amends but Roberts makes a good challenge.
Ashton's clearance skews over Day's bar - but United waste the corner.
Day made that fine save early on but Simonsen has not had too much to worry about so far.
There is so much at stake tonight, that must be having an effect on both sides - and the fans.
It's all a bit frantic from both sides, no-one managing to hang on to the ball when they do get it.
Final ball from Porter lacking, allowing Stevenage time to breathe.
Stevenage get a throw in in United's half, but end up giving it away and are pushed back.
Day not threatened at the corner and United give away a free kick that the Stevenage keeper clears downfield.
Stevenage really are on the backfoot and they concede a corner.
The cameras have just shown United legend Tony Currie - what a good player he was, this game could do with a bit of his quality.
Roberts hoofs it clear, before Lascelles repels another United attack.
The ref is Nigel Miller, and he's just got a touch of the ball as United attack.
Roberts gives away a free kick as Porter hits the deck - the defender questions it, but there's no drama as United waste the opportunity with the ball going out for a throw in.
Nice turn from Freeman, who manages a bit of time on the ball - a rarity so far.
Hill's cross takes a deflection and Day has time to collect the ball loops down to him.
Stevenage waste a bit of possession and give Simonsen the chance to clear his lines.
United constantly probing down their left flank and testing Lascelles at right back.
All the pressure from the home side, Stevenage cannot get out of their own half.
Fine one-handed save from Day to deny Porter, who nodded it to the keeper's left from eight yards away.
Freeman forces a throw in for Stevenage, but the Blades defence is solid.
Lascelles clears as Porter lurks for United. Home side on top at the moment.
Stevenage can't make anything at the corner, but a lively start with tackles flying in as United try to break back.
Agyemang has an early chance but his shot is deflected wide.
United kick off.
There were 17 points between these two sides at the end of the league campaign, but that counts for nothing now. Teams are emerging, kick off is very close.
Tonight's odds are 8/11 for a United win, 7/2 on Stevenage and the draw is 11/4. A fair reflection on the narrow margin between these two. For more pop over to www.skybet.com.
From the Stevenage point of view, Adam Hartley says 'Keeping it level at half time 0-0 and then a late winning goal from Freeman and securing the final at Wembley. Fingers crossed.' Keep your views coming to email@example.com
Joe Angell predicts a 4-1 win for the home side and says: 'Stevenage play good football but Sheffield Utd are too powerful for them.'
Dave 'Lord' Heath, a Blade, says: 'I'm going to say 2-0 for the Blades. May the best team win.' Very fair-minded!
Blades keeper Steve Simonsen is fairly confident they can finish the job on home turf: 'When we're at home we feel as though it's up to us to take the initiative and we've done that all season long. We will be playing no differently to how we have all season long at home.'
Friday night's first leg was a tight, tense, goalless affair with Stevenage closest to scoring when Reid rattled the woodwork. Could we be in for penalties tonight?
I'm Tim Oscroft and I'll be providing regular live updates from tonight's game at Bramall Lane. Email me at firstname.lastname@example.org - what do you think of the team selections? Let me know and I'll post the best comments before kick off at 7.45pm.
The Blades are unchanged, while Shroot replaces Reid for Stevenage.