#3 Arsenal 2001-02
Arsene Wenger had revolutionised the club within a few years but in 2001, Manchester Utd had just won their third Premier League title in a row. The last two Premier League campaigns had been humiliating for the London club as they could hardly compete with the Red Devils. 2001-02 seemed no different.
Manchester United, historically, did much better in the second half of the season than Arsenal. After the first 19 rounds of games were done, Arsenal led them by 3 points but surprise contenders Liverpool were leading the pack. Within a few weeks, Man Utd took over as the leaders and Arsenal were facing another season without winning the league.
However, Arsenal went on to have one of the best second half of the season England has ever seen. Out of the 19 matches, Arsenal drew 3 matches and won 16! They also went on to win the FA Cup as they completed the domestic double.