Lightning struck twice in the FA Cup, with Wigan's showdown against Manchester City once again going their way.

So, with the quadruple now out of the window, Manuel Pellegrini now has a few things to ponder if their season isn't going to suddenly falter.

Here are five things we learnt; even if he didn't!

1) Manchester City just didn't learn from last year

Wigan boss Uwe Rosler admitted after the game that he did in fact get his tactics from those of Roberto Martinez last season when Wigan won 1-0. So why didn't Manchester City actually take this into account and get their goals early and kill off the game?

Pellegrini is meant to be such a wise guy, but he certainly has missed a real trick here, as Wigan remained quite predictable, get a goal and then defend vividly.

2) Demichelis - What does Pellegrini see in him?

It's awful to watch him nowadays, and although I'm no footballer, I do still feel very nervous when Martin Demichelis is on the ball. He was in fact the one who gave away the penalty, and it isn't even the first time. His ball skills were atrocious, he can shrug and wave his arms around all he wants but really he's been very poor. 

City's new recruit has far from impressed me this season, and frankly I do believe that they have better players in Lescott, Nastasic, and even Micah Richards. 

3) Aguero and Negredo - Where's the formidable partnership got to?

They were the force of the season, unbeatable by all accounts. I suppose though they still are, but now sit overshadowed by the SAS partnership at Liverpool. Since Aguero picked up those two nasty injuries, it's just unsettled them ever so slightly.

Between the pair, they have 49 goals, which is a considerable amount when you think about it. So why couldn't they get a goal against Wigan? They've scored against harder previously.

I think that their perhaps patchy spell was proved at the weekend, both players struggled and eventually Negredo was replaced by Edin Dzeko who didn't do a bad job. It's questionable whether they've burnt themselves out because of their maximum efforts. 

4) If Wigan can beat them, who else can?

I'm probably over-reacting, but it is a question posed in my mind if nobody else's. Really, they could take no dignity from their defeat and it isn't a proud moment for them being beaten by a side who don't even feature in the same league as the Citizens.

And Manchester City have a lot harder games not long away, some this month in fact against Barcelona, Manchester United and Arsenal respectively. These pose sterner tests, and Manchester City cannot even say that they threw out their second team against Wigan, with Aguero, Negredo, Dzeko Toure and Navas, City's main names all getting a considerable amount of game time.

Has their season suddenly hit a snag?

5) Just score already! Where's the finishing touch?

Don't you remember the time when Manchester City were banging in the goals for fun? I do. The Citizens were a joy to watch and goals each game were guaranteed. 

So why could they only get one against Wigan? Only three shots on target out of twelve in total really isn't enough, with some of City's top European names embarrassing themselves with shots what only can be known as 'wild'. 

It's not the first time they've had plenty of chances, but failed to capitalise. It appears here they were taught a lesson.

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FA Cup
Manchester City
Sergio Aguero