It really was a Manchester derby for neutral and United fans to savour.The biggest fixture on the Premier League calendar was a chance for City to seal the title after one of the finest season's ever in England's top-flight, but it wasn't to be at the Etihad.Pep Guardiola's side sailed into a commanding 2-0 first-half lead thanks to goals from Vincent Kompany and Ilkay Gundogan, but it all went wrong after the break.A Paul Pogba brace and a Chris Smalling goal earned United an unexpected three points, with Jose Mourinho's side now in pole position to finish second.The improvement in pretty much every single United player in the second-half was pretty spectacular, with Alexis Sanchez turning in his finest performance yet with his new club.He recorded two assists and was vital to Mourinho's defensive shape in the second half, protecting Ashley Young against the threat of Raheem Sterling at all costs.It was exactly why the Red Devils saw fit to hand him such a lucrative contract.Nevertheless, before kick off and even in the first 45 minutes, things weren't looking great for the Chilean.He was getting some serious slack from United fans on Twitter and one famous Arsenal fan was tearing into him; Piers Morgan.But, the Daily Mail journalist was made to eat his words in fantastic style. The beauty of hindsight.

MORGAN'S TWEETS

UNITED FANS' BEST REACTION

Ouch. Although, Morgan certainly wasn't the only person on Twitter to pay for their premature tweets about a United player after their first-half display.

Top journalists, fans and even Gary Neville on commentary were tearing into both Sanchez and Pogba, but were made to eat their words come 6pm Sunday.

Mourinho revealed after the game what he asked Sanchez and Jesse Lingard to change in the second half.

"I told my midfield players that they didn't need to improve because they were playing very well even in the first-half," he said.

"I think it's very difficult to be a midfield player against Manchester City and Paul, Ander and Matic were playing really well but I need more from Lingard and Alexis, I need them to connect our good football in midfield and especially I need my defenders to be a little more confident."

Well, it worked a treat, Jose.