Ahead of tonight's monster Champions League clash between Real Madrid and Manchester United, we take a look back at the 14 previous competitive meetings between Jose Mourinho and Sir Alex Ferguson.
1- Porto 2-1 Manchester United - Champions League last 16 2nd leg - 25 February 2004
Roy Keane sees red as Porto claim a precious win thanks to Benni McCarthy's late goal.
2- Manchester United 1-1 Porto - Champions League last 16 2nd leg - 9 March 2004
Costinha's late goal sends Porto through, as Jose rampages down the Old Trafford touchline.
3- Chelsea 1-0 Manchester United - Premier League - 15 August 2004
Eidur Gudjohnsen scores the only goal as Chelsea's period of domestic dominance begins.
4- Chelsea 0-0 Manchester United - League Cup semi-final 1st leg - 12 January 2005
Tempers flare in a tetchy goalless first leg at Stamford Bridge.
5- Manchester United 1-2 Chelsea - League Cup semi-final 2nd leg - 26 January 2005
Damien Duff's late goal sends Chelsea to Wembley.
6- Manchester United 1-3 Chelsea - Premier League - 10 May 2005
Fergie makes his chastened players give a guard of honour to Chelsea, who are already champions.
7- Manchester United 1-0 Chelsea - Premier League - 6 November 2005
Ferguson finally gets his first win over Mourinho as Darren Fletcher scores the only goal.
8- Chelsea 3-0 Manchester United - Premier League - 29 April 2006
Mourinho's men clinch the title (though their banners are from last season) and Wayne Rooney suffers injury six weeks before the World Cup.
9- Manchester United 1-1 Chelsea - Premier League - 26 November 2006
Goals from Louis Saha and Ricardo Carvalho cancel each other out at Old Trafford.
10- Chelsea 0-0 Manchester United - Premier League - 9 May 2007
Now it is Chelsea's turn to give a guard of honour to champions United, whose shadow team earn a draw.
11- Chelsea 1-0 Manchester United - FA Cup final - 19 May 2007
But Chelsea end the season on a high as Didier Drogba's extra-time strike wins the FA Cup.
12- Manchester United 1-1 Chelsea (United win on penalties) - Community Shield - 5 August 2007
Chelsea miss all three of their kicks in the shootout as United win the season-opener at Wembley.
13- Internazionale 0-0 Manchester United - Champions League last 16 1st leg - 24 February 2009
A hard-fought first leg in Milan ends goalless but Mourinho's Inter are under pressure.
14- Manchester United 2-0 Internazionale - Champions League last 16 2nd leg - 11 March 2009
Goals from Nemanja Vidic and Cristiano Ronaldo send United through to the last eight.