Champions Rangers continued their relentless run towards an unbeaten season at the expense of Celtic.
Steven Gerrard' s side ensured an unbeaten record against their Glasgow rivals closed in on the 100 point mark in the Premiership.
A first half goal from Kemar Roofe was followed immediately by a red card for Callum McGregor.
Odsonne Edouard equalised but a frantic few minutes saw Alfredo Morelos hit back almost immediately.
Roofe added a second after the break before Jermain Defoe piled on the misery late on.
Here's how the Rangers players rated on the day.
Allan McGregor
Once again a difference maker with a fingertip shoving Elyounoussi’s strike from distance onto the crossbar. One or two moments of danger but spent the second half as a virtual spectator. 8
James Tavernier
Trademark delivery to pick out Morelos for early chance and repeated the feat after the break to create havoc inside the Hoops box. Relished the chance to get one-on-one with Taylor. 8
Connor Goldson
Another solid display with no frills and did the simple things well. Brilliant block to deny Edouard shooting chance and a pillar of strength for side in these fixtures as he underlined his value. 7
Jack Simpson
First taste of an Old Firm clash for the Englishman picked up an early booking for clattering into the back of Edouard. Refused to be flustered and focused on doing the basics and looked the part by being well disciplined in his position. 7
Borna Barisic
Allowed Edouard to get free at Celtic’s leveller but floated cross for Roofe header was a thing of beauty. Mark of quality when on the ball before pulling up with a thigh problem. 7
Joe Aribo
Guilty of being too easily robbed of possession during opening exchanges but box to box picture of industry and crucial ball carrier as game progressed. Added flair and forward momentum before slotting into left back role for last ten minutes. 7
Steven Davis
Brought his usual calm authority to proceedings and superb sliding challenge stopped Edouard pulling the trigger on the stroke of half-time. Dictated tempo and play as the most intelligent midfielder on show by a distance. 8
Glen Kamara
Neat and tidy as he sat deeper in midfield alongside Davis to dictate play and win the lion's share of possession. Another quick thinker in a Gers midfield which cruised it. 7
Kemar Roofe
Tirelessly worked the Hoops defence in tandem with Morelos and used his body to redirect a shank from Kent with his chest for improvised finish at opener. Burst through Hoops defence to bullet home his second sign of a ruthless finisher. 8
Alfredo Morelos
Ran off an early knock but fluffed his lines by failing to convert back post chance in 12th minute. Emphatic left foot finish for side’s second and a lively and menacing figure until limping off late on. 8
Ryan Kent
Key to the door for Rangers, operated in central role off the twin strikers and major creative force with vision and slight of foot. Wildly volleyed over the top with first half chance but pivotal role at Roofe’s opener. 8
Subs
Scott Wright: Replaced the injured Barasic but little impact of note. 2
Ianis Hagi: On for Morelos to see out win for the final six minutes. 2
Jermaine Defoe: Fired in an injury time fourth with composed and clinical finish. 6
Subs not used: Itten, Stewart, McLaughlin, King.
