Just four points separate the Premier League's top five after a remarkable start to the season.
Unexpectedly, it is Leicester City who lead the way at the top of the table while champions Chelsea sit 15th after their nightmare start to the season, but who will take the top spot come the end of the 2015/16 season?
Despite their shock defeat to Liverpool last weekend, Man City remain the bookmakers' favourites to lift the trophy, but you have to look back to a few weeks ago to understand why.
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Manuel Pellegrini's men steamrolled their way through the first weeks of the season and were unbeaten in nine before Saturday. Not only this, but their squad is packed with quality and in Sergio Aguero, they possess a world-class goal scoring talent.
Raheem Sterling and Kevin De Bruyne are only a glimpse of what is to come for City in the future.
However, the defeat caused by Liverpool highlighted one of City's major problems - central defence. Despite investment in Eliaquim Mangala, Nicolas Otamendi and Martin Demichelis, it still remains one of their biggest weak spots. Equally, they also do not possess a full-back under the age of 30.
In attack, there are question marks over Aguero's injury record and Wilfried Bony is yet to prove he is good enough to lead the line alone.
For all of the criticism, United have a habit of grinding out results under Louis Van Gaal. Youngster Anthony Martial has been an inspiration in attack whilst David de Gea has boosted their chances staying at Old Trafford in the summer.
Their biggest cause for optimism, though, is their impressive defensive record. No team has conceded fewer goals (9) or kept more clean sheets (8).
But with their recent style of play there have been serious doubts whether United have the creativity to win the title. Despite being one point off the top, they rank 15th for chances created (100, compared to City's 178).
They struggle to break teams down and fans are constantly imploring Van Gaal to show more attacking intent which just isn't there at the moment.
The Jurgen Klopp factor is beginning to take shape and the German has put his arm around the players who were underperforming during Brendan Rodgers' tenure. His high-intensity playing style and tactical expertise have brought an instant improvement.
City and Chelsea have felt the full force of Klopp's men and the Reds are beginning to climb the table.
With every positive comes a negative and Liverpool are eight points behind leaders Leicester. There are also concerns over squad depth - Mamadou Sakho the most recent player to hit the injury list.
It could also prove tough for the players to cope with the high-pressure, hard-running style as the season goes on.
Arsenal's squad has been the strongest we've seen since their move to the Emirates. Petr Cech has been a big upgrade in goal and competition for places has brought the best out of Olivier Giroud and Theo Walcott.
Mesut Ozil has been delivering on a consistent basis, leading the way for chances created this season (56). The Gunners have also racked up impressive wins against United and Bayern Munich and an early Champions League exit would allow them to focus on the league.
A familiar problem has threatened to derail Arsenal once again. Their injury list has now hit double figures with Francis Coquelin being the latest addition to be struck down by injury.
Mikel Arteta and Mathieu Flamini are both aging and injury-prone so they don't have much to offer other than experience. Defending set pieces are another aspect Arsenal must improve, defeats to West Brom and West Ham have shown their worrying complacency.
Leicester are already on top of the table so why shouldn't they be able to stay there?
In-form striker Jamie Vardy is one of the many factors that have made Claudio Ranieri's side so consistent.
The English striker recently equalled the record of scoring in consecutive games (ten from ten). They also have a shrewd, experienced manager in Ranieri.
Since April, they have taken 50 points from a possible 66 and even if they don't win the title, a European spot is definitely on the cards.
The Foxes were on the brink of relegation last season and the squad they have now is vastly inferior to that of the top sides.
Their swashbuckling attacking displays have masked a defensive weakness and things are only going to get tougher in the fixtures to come - with United, Chelsea, Everton, Liverpool and City all on the way.