FT: Celtic 5-1 St Mirren - Daizen Maeda steers in early on; Reo Hatate slots home from spot with Ben Taylor dismissed for the handball; Oh Hyeon-gyu nets first Celtic strike
Mark O'Hara scores from the spot for visitors Greg Kiltie is brought down only for Matt O'Riley & Hatate to counter
AET: Ayr 4-1 Elgin - Kane Hester puts underdogs ahead before Fraser Bryden levels at the death; Ben Dempsey & Dipo Akinyemi (2) score in ET
FT: Dundee Utd 0-1 Kilmarnock - Kyle Vassell nods in from Danny Armstrong corner; Loick Ayina sent off late on for hosts on debut
FT: Livingston 0-3 Inverness CT - Billy McKay gives Championship club advantage before Sean Welsh makes it two; McKay nets third
FT: Raith Rovers 3-1 Motherwell - Jamie Gullan & Sam Stanton score; Kevin van Veen lashes in scrappy effort before Ismael Goncalves scores on debut
Dundee Utd 0-0 Kilmarnock
Dundee United midfielder Scott McMann is booked for a heavy challenge on Danny Armstrong.
Once the Killie winger gets the feeling back in his right leg he's scampering down the right wing to send in a cross for Christian Doidge, who heads over the bar.
That's Kilmarnock's best chance of the game.
Livingston 0-0 Inverness CT
Jane Lewis
BBC Sport Scotland at the Tony Macaroni Arena
There's an air of frustration here from the home fans. Inverness are being allowed some room to venture forward at times without too much trouble.
Livi fans would like to see their players playing with a bit more urgency - "play the ball forward" is a common comment from the stands. Patience could be key, if not in supply at the moment.
Image source, SNSRaith Rovers 1-0 Motherwell
Brian McLauchlin
BBC Sport Scotland at Stark's Park
The 2,000 fans that have travelled from Lanarkshire to support ‘The Well’ have gone very silent since Rovers took the lead.The confidence in the home side is evident but you can visibly see the Motherwell players are struggling and the spark that Stevie Hammell spoke about in his pre-match interview is simply not there.Hammell has only been in the Fir Park job for around seven months and has tried numerous players and systems in recent weeks but it's not working out right now.
Image source, SNSKevin van Veen and Motherwell have had a frustrating start at Stark's Park
Dundee Utd 0-0 Kilmarnock
Tyrone Smith
BBC Scotland at Tannadice
A Danny Armstrong corner from the right, that flew over the heads of everyone before going straight out of play on the left sums this game up so far.
Image source, SNSAyr Utd 0-0 Elgin City
Ayr continue to dominate but are yet to break Elgin down as this time Alex Kirk has a pop from distance that’s narrowly wide.
Livingston 0-0 Inverness CT
A couple of injury stoppages at the Almondvale, with the hosts on the end of a few rough challenges from Inverness.
It's resulted in Bruce Anderson being replaced by Cristian Montano, while both Jack Fitzwater and Ayo Obileye have received treatment.
Image source, SNSBruce Anderson came off after 13 minutes
Raith Rovers 1-0 Motherwell
The only goal in the Scottish Cup so far today is Jamie Gullan's penalty for Raith Rovers against Motherwell.
Image source, SNSDundee Utd 0-0 Kilmarnock
Midfield duo Ilmari Niskanen and Mathew Cudjoe combine well in the final third for Dundee United and feed the ball out to Glenn Middleton down the left wing.
The muscular winger gets past Lewis Mayo but the big defender chases back and does enough to put Middleton off in the box and Killie escape with a goal kick. Better football from the hosts.
Raith Rovers 1-0 Motherwell
This was the incident that led to Raith Rovers' penalty with Jamie Gullan's shot coming off Callum Slattery's arm.
Image source, SNSDundee Utd 0-0 Kilmarnock
Ilmari Niskanen makes up for a dreadful forward pass from midfield that went straight through to Sam Walker in the Killie goal by matching the run down the right by Danny Armstrong to concede a corner.
Kilmarnock have had some success in changing the direction of play but the game is lacking players being composed on the ball.
Raith Rovers 1-0 Motherwell
Raith have the bit between their teeth and come agonisingly close to a second.
Dylan Easton with a vicious, curling effort from out wide that just doesn't bend enough in time.
George Oakley
George Oakley nets his second in two minutes to put Morton in front.
Image source, BBC SportGeorge Oakley
George Oakley taps in from close range to bring Morton level in the Scottish Championship.
Image source, BBC SportDundee Utd 0-0 Kilmarnock
Tyrone Smith
BBC Scotland at Tannadice
Even after just the opening exchanges, this really does have the feel of the game that could go this distance. A tousy affair between two sides that have been struggling for form.
Image source, SNSKilmarnock manager Derek McInnes issues instructions from the dugout
Gullan, penalty
Jamie Gullan wins, and slots, the penalty home.
Right down the middle, cool as you like.
Image source, BBC SportRaith Rovers 0-0 Motherwell
Callum Slattery extends his arm out as Jamie Gullan's shot strikes the Motherwell man's limb.
Ayr Utd 0-0 Elgin City
Championship Ayr dominating early possession at Somerset Park as Paddy Reading fires over from range.
Grant Savoury
Grant Savoury's sidefoot half-volley put Queen's Park in front in the Scottish Championship.
Image source, BBC SportRaith Rovers 0-0 Motherwell
Dylan Easton is gifted all the time in the world to glide through the Motherwell half and get his shot away in the box.
Some decent last-ditch defending from Stephen O'Donnell required to deny the Raith forward.
Livingston 0-0 Inverness CT
Lively start at Livingston with both clubs enjoying bursts forward.
There's a Livingston chance when they win a free-kick 25 yards from goal. Steven Bradley steps up. He scored a set-piece peach against Stenhousemuir in the last round and this time he forces a great save from Mark Ridgers.
The resulting corner comes in and Ayo Obileye blazes wide at the back post.