#3 Antonio Conte (2016-18)
Antonio Conte arrived at Stamford Bridge having to fix a broken Chelsea FC, fresh off a 10th-place finish. Conte had the seemingly impossible job of transforming the side into a title contending team once again.
Despite a tough start to life at the Bridge, Conte did manage to turn things around with an incredible 13-match unbeaten streak that saw him guide the Blues back to the top of the mountain, winning the Premier League in his first season.
Conte set a Premier League record (which has since been broken by Manchester City), winning 30 games in one season and managed to reach the FA Cup final in both of the seasons he was in charge.
However, Roman Abramovich's impatience was clear, sacking Conte after his second season due to him failing to win a trophy. It was a baffling decision that many didn't agree with at the time due to how well he had done in charge of the Blues, but was a perfect example of why managers fail to stay long term at the club.
Only Avram Grant boasts a better win percentage than Conte, who won 65.1% of his games in charge. And when you consider how many more games he was the boss for, his stats really are very impressive.