- FT: Motherwell 5-0 St Mirren (Erwin 2, McDonald, Sutton 2)
- Buddies now 10 points behind at the bottom
- FT: Ross County 1-0 St Johnstone (Boyce)
- Seventh win in eight-game unbeaten run for Staggies
Please join us again tomorrow evening for more live Scottish football coverage. Highlights of tonight's games will be available on the BBC Sport website on Wednesday.
St Johnstone manager Tommy Wright
"I don't think we passed the ball well enough. We didn't do enough to win the game."
Almost time for me to go...
john grant: "St Mirren are doomed to life in the Championship next season. Shouldn't have got rid of Danny Lennon! #bbcscotfootball"
As well as the Premiership games, there are four Championship fixtures on Wednesday evening.
Promotion hopefuls Hibernian visit Dumbarton, champions Hearts host Alloa Athletic, who have just appointed Danny Lennon as manager, fourth-place Falkirk travel to face bottom side Livingston and Raith Rovers take on Cowdenbeath.
Ross County manager Jim McIntyre
"Absolutely delighted for Liam Boyce to get his goal. He's been a big part of this run. We showed great desire to keep grinding. We kept at it and we got our just rewards in the end with great perseverance."
Partick Thistle now find themselves only a point above 10th-place Ross County and the Jags face the Scottish Premiership leaders at Celtic Park.
Second-place Aberdeen host third-place Inverness Caledonian Stadium. An eight-point gap currently exists between the sides.
And there's a Dundee derby at Dens Park with United looking to arrest a run of nine matches without a win.
Let's look at tomorrow evening's fixtures...
Motherwell manager Ian Baraclough
"I'd have taken one but the boys performed very well. We've got to match [Ross County] stride for stride. The three strikers are all firing and it's pleasing for a manager to have selection headaches like that."
Anonymous: "Massive game for the jags on Saturday"
Anonymous: "I think St Mirren are gone,but who goes into the play off place,County,Motherwell,Thistle even Kilmarnock ,going to the wire"
St Mirren manager Gary Teale
"Extremely disappointed. Schoolboy errors for the goals. It's going to be nigh on impossible to get out of it. I'm hurting."
Craig: "Horrendous display from saints. Never going back to Dingwall again, what a waste of time. Mcfadden was no where to be seen."
Gordon in Falkirk (and not bitter at all about last year): "Guys. Can Hamilton be caught by Motherwell and County if they lose all their games and the other 2 win all theirs and draw against one another. I made a small wager that the Accies would end up in the playoff place when AlexNeil left."
Andy, concerned Jags fan: "St Mirren gone. Thistle and potentially Killy not out of it. Jags form vs bottom 6 not good. Schedule of post split fixtures could be crucial! Ideally ross co and motherwell play early..."
Motherwell forward Scott McDonald
"We're winning games but we want to get better. I think finally the gaffer's message is getting across. We're a danger for anyone. We're looking onwards and upwards."
Ross County maintain their three-point lead over 11th-place Motherwell and extend their advantage over St Mirren to 13 points with a seventh win in their last eight.
It's all over at Fir Park and Motherwell go 10 points clear of sorry St Mirren. Dominant display from the visitors. Bottom place Buddies have a mountain to climb.
Fine save from George Long at Fir Park as he clutches John McGinn's swerving shot from 30 yards.
Euan Crabb: "#bbcscotfootball I thought right at the start of the season St Mirren were contenders for relegation & time has proved me right!"
Ross County take a late lead at Victoria Park with Liam Boyce looping a header past Alan Mannus following Jamie Reckord's cross.
It's a fifth for Motherwell and a second for substitute John Sutton, who toe-pokes over the line after Scott McDonald's shot had been.
What do these results mean for the rest of the season? Let me know your thoughts...
Text 80295 or tweet using the hashtag #bbcscotfootball
It's just not been St Mirren's night. Stephen Mallan finds some space in the box and curls a shot onto the post.
And then Liam Boyce threatens for County. He twists and turns and elects to shoot rather than pass to Craig Curran and the ball goes wide. The pass might have been the better option...
Saints keeper Alan Mannus holds on with a diving save as an awkward, bouncing free-kick takes a nick off team-mate Steven Anderson's head.
John Sutton heads Marvin Johnson's inswinging free-kick past Mark Ridgers. Too easy against for Well.
Motherwell will go 10 points clear of bottom side St Mirren. Ross County will be 11 points clear of the Buddies. St Johnstone will go level on points with third-place Dundee United.
Motherwell close to a fourth as Conor Grant's low strike from the left is palmed away by Mark Ridgers.
George Long gets down to block Marc McAusland's header. A rare chance for St Mirren.
Following a spot of head-tennis, an awkward volley from Martin Woods is deflected over, and from the corner Jackson Irvine sends a header wide. It's just not happening for the Staggies in front of goal.
Liam Boyce cuts in from the right to have a lash at goal but finds his path blocked by two sliding St Johnstone defenders.
Stephen Pearson limps off to be replaced by Conor Grant. Pearson received warm applause from the Motherwell fans as he came off.
Motherwell are comfortable on the ball and are still looking for any opportunity to add to their lead. St Mirren are toiling and the half-time introduction of Steven Thompson and Gregg Wylde has not yet had the impact manager Gary Teale would have been hoping for.
County's Craig Curran dips a shoulder and goes past his marker to flash the ball across goal. Rafa Da Vitta dives in at the back post but cannot steer his header on target from close range.
Saints skipper Dave Mackay is next to be cautioned for upending Rafa Da Vitta inches from the penalty box. The home players' appeal half-heartedly for a spot-kick and the free-kick, played in low from the left, is easily mopped up by the visitors.