FT: Queen of the South 3-0 Dundee - Dobbie hat trick to take season's tally to 37
FT: Stenhousemuir 1-4 Aberdeen - McGinn, Cosgrove (pen), Stewart & Donaldson og; Munro for League One side
Original ties both ended 1-1
FT: Ayr Utd 2-3 Inverness CT - hosts miss chance to go top of Championship
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Stephen Dobbie
It's looking increasingly like it is going to be Aberdeen at home to Queen of the South in the fifth round as Stephen Dobbie scores his second of the night against Dundee.
The veteran goal machine taps in after a bad mistake in defence by Ryan Innis.
Queen of the South 1-0 Dundee
What a way to score your 35th goal of the season (if you include the Challenge Cup). There's just no stopping Stephen Dobbie.
Image source, SNSStenhousemuir 0-3 Aberdeen
Sam Cosgrove's goal is his 10th in 10 games. Stunning strike rate from the big Englishman.
From goal-shy to goal-machine - the rise of Cosgrove
Image source, SNSGreg Stewart
Greg Stewart swivels round, leaving his marker chasing ghosts, and dinks the ball over Stenhousemuir goalkeeper Graeme Smith.
Lower league sides rarely get a second chance of an upset, even when they are at home, and Aberdeen are showing the difference in class between the sides.
Stenhousemuir 0-2 Aberdeen
Willie Miller
Former Scotland defender on BBC Radio Scotland
Quote MessageA little bit of uncertainty in the Aberdeen defence, but from Stenhousemuir's point of view, at least they're getting themselves up the park. They haven't been up there much tonight. It's territory they haven't dominated
Ayr United 0-3 Inverness CT
A win tonight would have taken Ayr top of the Championship. Instead, it looks like Caley Thistle will be roaring into fourth place after three goals in the first 18 minutes.
Image source, SNSAyr United 0-3 Inverness CT
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Stenhousemuir 0-2 Aberdeen
Derek Ferguson
Former Rangers and Hamilton midfielder on Sportsound
Quote MessageCosgrove was cool as a cucumber there. Aberdeen are in complete control of the game. It was a definite penalty too
Liam Polworth
Image source, SNSQueen of the South 1-0 Dundee
Scotland's top scorer v wrestler Grado
Stephen Dobbie has scored his 30th (!) goal of the season to give the Championship side the lead against Premiership visitors Dundee. It's been quite a week for the veteran striker...
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Sam Cosgrove (penalty)
Greg Stewart is take out by Graeme Smith as he goes to round the Stenny goalkeeper and the referee points to the spot.
Up steps Sam Cosgrove and the big striker slots his 10th goal in 10 games.
Image source, SNSStephen Dobbie
What did I tell you about Queens and Stephen Dobbie.
The evergreen 36-year-old striker slots his 30th goal of the season with a glorious 25-yard screamer.
There's going to be no fairytale at Ochilview, but maybe a Premiership side is going to take an exit tonight after all.
Image source, SNSNathan Austin
Nathan Austin scores his second of the net and it is all going wrong for Ayr, two down after 11 minutes.
The home side are all over the place in defence.
Image source, SNSStenhousemuir 0-1 Aberdeen
Derek Ferguson
Former Rangers and Hamilton midfielder on Sportsound
Quote MessageIt's the dirty side of the game Aberdeen are doing pretty well with at the moment. They're playing with a lot of quality, but any time Stenhousemuir get the ball, Aberdeen are shutting them down
Nathan Austin
It's not going Ayr's way at Somerset as Nathan Austin gives fifth-top Caley Thistle the lead against the side looking to take over at the top of the Championship.
Image source, SNSStenhousemuir 0-1 Aberdeen
Another example of Scott Wright's electric pace as the Dons winger leaves his full-back for dead and his cross is lashed clear by Mark Ferry and is close to an own goal before lofting over the bar for a corner.
From the corner, Greg Stewart hesitates in front of goal and the chance is gone.
Queen of the South 0-0 Dundee
Veteran former Republic of Ireland centre-half Darren O'Dea is playing an unusual role in central midfield for Dundee.
Both sides are playing two strikers, though, so they are going all out for the win - as they have to as it is a cup replay.
Queen of the South v Dundee (19:45)
Three changes to the Dundee team that lost to Motherwell on Saturday, with Martin Woods, Jesse Curran and Andrew Nelson dropping out to be replaced by Darren O'Dea, Roarie Deacon and Kenny Miller.
Queen of the South show two alterations to the side who were beaten by Partick Thistle, with Callum Fordyce and Nicky Low in for Connor Murray and Josh Todd.
Stenhousemuir 0-1 Aberdeen
Derek Ferguson
Former Rangers and Hamilton midfielder on Sportsound
Quote MessageThat was a brilliant piece of play by Wright to set up the goal. Aberdeen at the moment look in total control.
Stenhousemuir 0-1 Aberdeen
Willie Miller
Former Scotland defender on BBC Radio Scotland
Image source, SNSQuote MessageThere is no doubt that McGinn has quality. He didn't show it earlier in the game, but I had no doubt that when he got in that position, he was going to find the net