Sutton United's Matt Tubbs celebrates scoring a goal
The FA Cup Fifth Round draw threw up some tantalising ties, here we look at the three biggest possibilities of an upset in this weekend's action.
1. Sutton United v Arsenal - Where else to start but the tie of the round? This is a game that screams upset and, if it were to happen, would be the biggest FA Cup shock of all time.
Sutton's player have the chance to write their names in the football history books forever and will make things as hard as they can for the Gunners.
Arsene Wenger's men will be reeling from their 5-1 humiliation at Bayern Munich during the week and a tricky tie away to a non-league side is perhaps the last thing Arsenal need right now.
However, the game will be played on a 3G surface rather than a boggy non-league pitch of the past, which will certainly help Arsenal to play their natural game, albeit in an intimidating atmosphere where they have everything to lose.
Arsenal manager Arsene Wenger looks on in Munich
One thing is for sure, if Arsenal fail to win this Monday night it will put an end to the debate 'What is Arsene Wenger's most humiliating defeat?'
Millwall's Steve Morison celebrates scoring the winner against Watford
2. Millwall v Leicester City - Another tie with upset written all over it.
Leicester fans must be sick and tired of pundits using the words 'last season' to draw comparisons with this year's woeful league performance.
Just like Wenger, the last thing Claudio Ranieri wanted from the Fifth Round draw would've been a tough trip to the Lion's Den.
Naturally, Millwall will have a vociferous support behind them for this clash against the reigning Champions of England and it will be a massive test of character to see how the Foxes respond to the challenge.
Indeed, Danny Murphy told the Evening Standard that he believes Leicester's players will succumb to the hostile atmosphere. Though, of course they still have a Champions League Last 16 tie to look forward to if they lose.
Huddersfield Town fans enjoying the 'Wagner Revolution'
3. Huddersfield Town v Manchester City - With Lincoln City and Oxford United travelling to Burnley and Middlesbrough respectively, this tie is the third most likely to see an upset.
Both Huddersfield and Man City would probably trade a win on Saturday for a victory on Tuesday night when they play Reading and Sevilla respectively.
With David Wagner's pushing for automatic promotion from the Championship and Pep Guardiola looking to make an impact in the Champions League, it seems likely that both men will play under-strength sides.
However, The Terriers are on a roll, picking up 32 points from a possible 39 and with the John Smith's Stadium sold out, there is a good chance that City could fall victim to the Wagner Revolution.