McGregor adds sixth for Celtic after first-half goals by Forrest (4) & Edouard
St Johnstone's Swanson sent off for swipe at Forrest
Arfield, Morelos & Kent score for Rangers; Dunne pulls one back
Hearts defender Smith dismissed after second yellow
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St Johnstone 0-5 Celtic
The depleted hosts are pinned back, camped on the edge of their own penalty area as Celtic knock the ball around, probing for another opening.
The 'good news' for Saints is Celtic have dropped the tempo considerably.
Rangers 3-1 Hearts
Rangers goalkeeper Allan McGregor is called into action as Arnaud Djoum gathers a loose ball before shooting from distance.
St Johnstone 0-5 Celtic
Peter Houston
Former Scotland assistant manager on BBC Sportsound
Quote MessageIt's a rush of blood from Danny Swanson. He's not catching James Forrest, he tries to get goal side but he's made no attempt for the ball, it's dangerous. He's let his manager down.
St Johnstone 0-5 Celtic
James Forrest sets off on another surging run only to be crudely brought down by a horribly late sliding challenge from Danny Swanson.
No attempt to play the ball whatsoever and the Saints midfielder can have no complaints about the red card shown to him by referee Kevin Clancy.
St Johnstone 0-5 Celtic
Are Celtic going to relax in the second half? Not a bit of it. Tom Rogic weaves his way forward, leaving a trail of blue shirts in his wake, and then pings in a shot that Zander Clark beats away.
HT: St Johnstone 0-5 Celtic
Given the half-time score at McDiarmid Park, the Sportsound team are hurriedly checking the record books.
The biggest away win in the top flight in recent times was Aberdeen's 7-0 at Dens Park in March 2017.
Celtic managed nine at home to the Dons in 2010.
HT: St Johnstone 0-5 Celtic
Paul Hartley
Former Celtic and Scotland midfielder on BBC Radio Scotland
Quote MessageIf you're a [St Johnstone] sub - you don't want on. This could easily be 10 for Celtic
Jimmy Dunne
Olly Lee swings a free-kick into the Rangers penalty area and Jimmy Dunne climbs high to head the ball into the net. A glimmer of hope for the 10-man visitors at Ibrox.
HT: St Johnstone 0-5 Celtic
Peter Houston
Former Scotland assistant manager on BBC Sportsound
Quote MessageIt's the speed of Celtic's play, their movement off the ball. I feel for Tommy Wright and St Johnstone but when Celtic perform like that they're unplayable.
It's been the James Forrest show in Perth this afternoon, with the livewire winger banging in an incredible four goals in 45 minutes. Odsonne Edouard got the other one, with the champions in rampant form.
Boos from the home fans. Saints have been absolutely ripped apart.
Image source, SNSJames Forrest celebrates the first of his four goals in Perth
James Forrest
It's four for James Forrest! Again, Tom Rogic is the man splitting open the home defence but Forrest has a lot to do from near halfway. He bombs forward, waltzes his way past a couple of half-hearted challenges, and slides another shot into the corner from the edge of the box.
Rangers 3-0 Hearts
A bad day just got worse for Hearts as Michael Smith is sent packing for a second yellow card after body-checking Jon Flanagan.
James Forrest (hat-trick)
It's the James Forrest - Tom Rogic combination again as the languid Aussie threads a lovely return ball for the winger to run on to and the Scotland international slips a cool finish beyond the exposed Zander Clark.
A first-half hat-trick is a pretty strong response to Forrest's midweek red card against Salzburg.
Rangers 3-0 Hearts
Up and running at Ibrox again. Is there any way back for Hearts? Visiting manager Craig Levein is sticking with the same XI.
St Johnstone 0-3 Celtic
Peter Houston
Former Scotland assistant manager on BBC Sportsound
Quote MessageSt Johnstone will need to learn from Craig Levein and let the grass grow a bit longer. This wet surface is just perfect for Celtic's swift passing game
James Forrest
Celtic slice St Johnstone open again as James Forrest works a slick one-two with Tom Rogic and then passes the ball into the back of the net with great precision.
St Johnstone 0-2 Celtic
Leigh Griffiths curls a free kick from 25 yards away from Zander Clark, who just gets a fingertip to it.
St Johnstone 0-2 Celtic
Saints are all over the place here as David Wotherspoon gifts possession to Odsonne Edouard. Quick as a flash, James Forrest is lining up a shot from 18 yards and it takes an outstretched leg from Jason Kerr to divert the ball over the crossbar.
Odsonne Edouard
A killer first touch from Odsonne Edouard allows the striker to gather a pacy pass from Kieran Tierney and arrow a shot low into the far corner from the edge of the penalty box.
St Johnstone 1-0 Celtic
Paul Hartley
Former Celtic and Scotland midfielder on BBC Radio Scotland
Quote MessageThe Celtic front players look up for it today in terms of the combination play and the movement.
Image source, SNSJames Forrest celebrates scoring the opener for Celtic