The main rival of Manchester United is Manchester City. but the manager of Manchester United, Sir Alex Ferguson is rivals with the manager of Chelsea, Jose Murinho.
Arsenal is Tottenham Hotspur's main rival.
Tottenham Hotspur, Chelsea, Fulham, West Ham United and Manchester United
Lamborghini is the main rival for Ferrari.
Their main rival is Manchester United
The name of Edison's main rival was Nikola Tesla.
Manchester United or Chelsea.. Always changes Manchester Utd and Chelsea are their biggest competition, but their true rival is tottenham
The main rival of FC Schalke is Borussia Dortmund.
Chargers
England is Australia's main rival at the World Championships and Commonwealth Games.
The main rival now is Alabama. Following that would be Auburn.
Spain was their main adversary
Assyria