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
Raith Rovers v Motherwell (15:00)
Raith Rovers: MacDonald, Dick, Nolan, Lang, Millen, Spencer, Brown, Easton, Stanton, Connolly, Gullan.
Substitutes: Thomson, McBride, Ngwenya, Young, Masson, Goncalves.
Motherwell: Kelly, O'Donnell, Casey, Butcher, McGinn, Slattery, Spittal, Tierney, Danzaki, Obika, Van Veen.
Substitutes: Oxborough, Crankshaw, Aitchison, McKinstry, Cornelius, Johnston, Furlong, Goss Ross.
Ayr Utd v Elgin City (15:00)
Ayr Utd: McAdams, Reading, McGinty, Kirk, Houston, Dempsey, Mitchell-Lawson, McAlear, Smith, Mullin, Akinyemi.
Substitutes: Albinson, McKenzie, Ashford, Bilham, Watret, Bryden, O'Connor, McAllister, Tomlinson.
Elgin City: McHale, Mailer, Cairns, McHardy, Dolzanksi, Draper, Dingwall, Cameron, Hester, MacEwan, Findlay.
Substitutes: Cooper, Anderson, Antoniazzi, Lawrence, Allen, Dunn, Hoban.
Four games in the fourth tier and leaders Dumbarton can stretch their lead at the top.
Image source, BBC Sport
Image source, BBC SportJust the one game also in League 1 with Dunfermline able to extend their advantage at the top.
Image source, BBC Sport
Image source, BBC SportIt's not ALL about the Scottish Cup today. There's an important fixture in the second tier.
Victory for Queen's Park today would stretch their lead at the top of the Championship while Morton are seeking to climb into the top four.
Image source, BBC Sport
Image source, BBC SportRaith Rovers v Motherwell (15:00)
Today's tie at Stark's Park is where most will expect to see a surprise in the last 16.
Motherwell are in wretched form in the Scottish Premiership and their only win so far in 2023 came in the previous round of the Scottish Cup.
Contrast that with hosts Raith Rovers, who are unbeaten in 11 games in all competition.
The last meeting of these two teams was in 2007, a 3-1 League Cup win for Well.
Image source, SNSMotherwell players get acclimatised with the Stark's Park pitch
Livingston v Inverness CT (15:00)
Inverness Caledonian Thistle are the visitors at Livingston but did not expect to be.
The Highlanders lost 2-0 to Queen's Park in round four but the result was overturned to a win for Inverness after Queen's Park fielded an ineligible player.
Livi would likely be happy to play anyone right now, given their form. Only Celtic have beaten David Martindale's side so far in 2023.
However, Inverness left the Tony Macaroni Arena with a win back in July when the sides met in the League Cup first round group stage.
Image source, SNSBilly Dodds' Inverness were given a Scottish Cup reprieve
Dundee Utd v Kilmarnock (15:00)
Scottish Premiership rivals Dundee United and Kilmarnock meet for the fifth time in all competitions this season, having also played each other in the League Cup this term.
Killie have the upper hand with two wins but United defeated the Ayrshire side in their last encounter at Tannadice. Their first encounter this season was a draw.
The visitors have already been to Hampden once this season in the League Cup and are eager to do likewise in the Scottish Cup. For United, survival in the Premiership is the priority but a cup run is always welcome.
Image source, SNSAyr Utd v Elgin City (15:00)
Ayr United meet a side two divisions below the in the shape of Elgin City.
The hosts may be second top of the Scottish Championship but Elgin travel in fairly decent form with just one defeat in five in all competitions.
These two met in this season's Scottish League Cup first-round group stage with Ayr triumphing on penalties after a 0-0 draw.
Image source, SNSSomerset Park is one of Scottish football's old school grounds
15:00 kick-off, except where stated
Image source, BBC SportIt's the second big Scottish Cup weekend of 2023 as the remaining participants set their sights on quarter-final places.
Five ties in total today, with the first four of those at 15:00.
Image source, SNSThe famous lid of the Scottish Cup trophy