4 upsets that could happen in the Premier League this weekend

#1 West Ham vs Chelsea

Hazard was the hat-trick hero for Chelsea FC v Cardiff City

Maurizio Sarri was announced as Antonio Conte's replacement in the summer, and a lot of skepticism was raised over his suitability for the role, as despite his attractive style of football, it was felt that he did not have the requisite CV befitting a club the stature of Chelsea.

Two months into his tenure though, and the doubters are slowly being won over, as Chelsea are one of only two teams with a 100 percent record in the EPL after five games, and sit top of the table on Liverpool with goal difference.

They come up against a West Ham side who were one of the window's biggest spenders, and announced PL winning manager Manuel Pellegrini as their new gaffer in a bid to take the club to the next level.

Things did not however go according to plans for The Hammers, as they are without a point in their first four games, with that miserable run only coming to an end last week at Everton.

With the pressure of getting the first points on board now behind them, the club can now focus on climbing up the league, and Sunday's clash against Chelsea represents a perfect opportunity to achieve their second victory of the season.

The Blues will arrive the Olympic Stadium in a fatigued state, having traveled to far away Greece to play their Thursday night Europa League clash with Paok, and as if that wasn't bad enough, they had to contend with the misery of having their flight back to the UK delayed.

Chelsea are undoubtedly one of the in form teams in the league at the moment, but West Ham's desperation to climb up the table as well as Chelsea player tiredness are factors which could see the East Londoners upset their West London neighbors on Sunday.