After last weekend's surprises and upsets, who knows what's going to happen in the Octagon this Saturday. The main card is chock full of battles with the potential to go either way.

In the night's featured fight, the recently unretired Randy Couture (Pictures) gets another crack at the heavyweight title against champion Tim Sylvia (Pictures). You have to have serious stones to climb inside a cage at the age of 43 and agree to fight just about the largest heavyweight champion on record.

But before the title bout, other former UFC champs take to cage to reclaim recently lost glory. Former welterweight champ Matt Hughes (Pictures) faces TUF 4 runner-up Chris Lytle (Pictures) and former middleweight king Rich Franklin (Pictures) takes on rising star Jason MacDonald (Pictures).

Two fearsome light heavyweights clash when Renato Sobral (Pictures) and Jason Lambert (Pictures) settle their differences. And rounding out the main card, Martin Kampmann (Pictures) knuckles up with Drew McFedries.