The former Aston Villa midfielder delivered an assured performance for City against his old club.
The treble is still on for Manuel Pellegrini's men - they are in the title hunt, in the Capital One Cup final and still in the FA Cup - and their 4-0 win at Aston Villa was nothing short of totally convincing.
After the game, Delph took to Instagram to celebrate his side's win against his former club:
Manchester City fans, meanwhile, were absolutely delighted with the 26-year-old's performance against Villa.
And they made their feelings clear on Twitter, having another go at the Aston Villa supporters who continue to slate Delph.
It seems they will never realise exactly why Villa fans have so much hate for the midfielder - it's the way he left them not the fact he chose City for footballing and financial reasons.
Either way, though, it's the Manchester City support once again having the last laugh. Here's how they reacted on Twitter to Delph's performance v Aston Villa:
Delph'll do fer me. Fantastic energy. Him and Fernandinho all over the park with Fernando sat in. #MCFC— NG (@NJG84) January 30, 2016