Football Classic: Roy Keane & Patrick Vieira coming to blows at Highbury in 1999

In August 1999, Ferguson's Man Utd took on Wenger's Arsenal at Highbury. Man Utd defensive midfielder Roy Keane and his counterpart at Arsenal Patrick Vieira came to blows on the pitch.

You can really take your pick from 1998-99, 2004-05 and so many other flashpoints between those two, but Manchester United's 2-1 win over Arsenal at Highbury was probably the volcanic peak, not least because one of them scored twice to win the game and they so dictated it by going head to head as well as the fact this was when the rivalry - between the two clubs and two players - was at its most ferocious. 

The Premier League still hasn’t seen anything like it, and these two best defined the aggression and energy that has so characterised the competition.