While many have had their eyes firmly fixed on the supposedly seismic clash in Manchester, up in Scotland the big derby has been an epic goalfest.
Unfortunately for Rangers fans, those goals were largely Celtic's as they dominated the Old Firm derby 5-1.
Moussa Dembele scored a hat-trick, the first Celtic player to do so against the new Rangers.
Some thought Rangers' Joey Barton had a game he would rather forget, particularly given his claim he could be the best player in Scotland when he signed this summer.
Meanwhile others think Celtic manager Brendan Rodgers must be over the moon.
Whichever side you were cheering for in the Old Firm derby though, remember it's just football - right?