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Chelse host Man United in Title race
Defending champions Manchester United take a three-point lead to west London to face their title rivals Chelsea.
Victory for Sir Alex Ferguson's team would take them six points clear of Chelsea, with two games remaining, but United's vastly superior goal difference - 54 to the Blues' 36 - would effectively give them an unassailable lead.
However, if Chelsea triumph they would be level on points with United to set up a potentially thrilling end to the season.
BBC Sport weighs up the two protagonists ahead of the Stamford Bridge clash.
With seemingly so little between the two sides, and with the stakes so high, Saturday's game could be decided by a piece of magic.
There are plenty of candidates capable of conjuring that killer blow
United have scored 13 more goals than their rivals and possess the country's runaway top scorer in 28-goal Cristiano Ronaldo, who has 38 in all competitions.
Carlos Tevez (13 goals) and Wayne Rooney (11) have also scored more times than Chelsea's leading marksman Frank Lampard (10).
But there is a glimmer of hope for the challengers.
Rooney and Ronaldo might strike fear into most sides but the Chelsea back line have proved a different proposition.
Ronaldo has yet to find the net in 11 games against Chelsea in a United shirt, while Rooney has failed to register in 15 matches against the Blues for Everton and Manchester United.
On the other hand, Chelsea have plenty of men with match-winning experience in these clashes, in the shape of Didier Drogba, Joe Cole, Ricardo Carvalho and Lampard.
A win for Manchester united would all but secure them the title