Rangers underlined their status as the Scottish Premiership’s dominant side with a third Old Firm league victory of the season against 10-man Celtic.
The game sprang to life with three goals and a red card for Celtic’s Callum McGregor within seven first-half minutes.
The midfielder saw red after Kemar Roofe’s opener, but Odsonne Edouard levelled before Alfredo Morelos smashed the champions back ahead, Roofe added his second and Jermain Defoe slid in a late fourth.
The victory means Rangers are two games away from an unbeaten league campaign, which would match their city rivals’ feat of 2016-17.
Celtic are already sure of second spot but trail their rivals by a galling 23 points, and have gone a full season without winning a derby for the first time since 1999-2000, losing four out of five games to Rangers in all competitions.
It was a sobering end to Celtic captain Scott Brown’s 14-year association with this fixture as the midfielder – who is joining Aberdeen next season – was replaced on the hour.
The reversal of supremacy in Glasgow football has been evident for some time now, given Rangers’ canter to a first league title for 10 years.
As a result, this was as close as you could get to a meaningless match between the sides, with the prospect of ruining Rangers’ unbeaten league run the only real boon for Celtic.
John Kennedy’s side have, at times, had the better of the play in the last three derbies, but Rangers have shown far more capable of stepping up in big moments, and so it proved here.
Goalkeeper Allan McGregor – outstanding all season – produced another terrific stop by touching Mohamed Elyounoussi’s shot on to the crossbar, an intervention which ultimately led to the opening goal.
Rangers went up the other end, Ryan Kent’s shot flew in front of Roofe, who showed fantastic presence of mind to divert the ball into the net with his chest.
As the Rangers players ran to celebrate their goal, Celtic’s McGregor was remonstrating with referee Nick Walsh, having been shown a second yellow inside three minutes for scything down Glen Kamara in the build-up.
From that moment, it looked ominous for the visitors, but Edouard nodded in after Kristoffer Ajer’s knock-down at a corner to provide an almost instant riposte and keep the game alive and intriguing.
But a symptom of the turnaround in these sides’ fortunes is the ability of one to go about their business with ruthless efficiency, while the other lacks conviction in every department.
Morelos demonstrated this perfectly as he jinked inside Brown before thumping the ball past a flailing Scott Bain and high into the net to restore Rangers’ supremacy.
It was a position that Gerrard’s side never looked like relinquishing, with diving headers from David Turnbull and Elyounoussi as close as Celtic came to an equaliser.
Instead, Borna Barisic teed up Roofe to head home Rangers’ third, with the English forward given the freedom of the Celtic box to pick his spot.
Defoe was afforded similar scope inside the penalty era, skipping past a weak challenge from Stephen Welsh to slide in a fourth goal and complete the rout.
Another routine win for Rangers. Another soul-sapping defeat for Celtic.
