Okay I'm gonna have to level with you guys on this one. The juggernaut is unstoppable at full speed, however it is possible for beings with amazing physical strength to change the course of his trajectory. The juggernaut is just short of invincible and would easily do damage to the hulk. Now this is where i see a problem. The hulk is absurdly strong having no limit i repeat without a limit to his physical capabilities the writers themselves have defined his power as without a finite limit. Ok so juggernaut comes in and he's mopping up the hulk quite easily, I think it would be too bold to say that assuming the hulk is in hulk form that juggernaut would destroy him in one move. This means the battle is over and im sorry but if the hulk survives juggernauts initial attack the hulk has won. Hulk has been reduced to bones and regenerated within minutes and his skin is nearly impervious. The juggernaut is known more for his invincibility then his offensive capability, and without that ability to kill hulk in a single punch the hulk will live on and get madder. As neither of the two tire or need to sleep or eat it would just be a slug fest until the hulk reached a level where his attacks would hurt juggernaut. Moral of the story: Kill hulk in human form and don't make him mad.

P.S. Yes juggernaut can shatter mountains but hulk has withstood attacks that would destroy continents.