I got to admit, that the only reason I like Juggernaut is because he just don't give a fu*k.
He would let Superman punch away at him, he would walk right through Superman's attacks. Superman would try to grab Cain, Cain would stomp right over him. Superman would shot his laser eyes, Juggernaut would walk right through it. Superman would go get a building to drop on Cain, he would succeed, but Caine would walk right through the building. Finally Cain would get tired of this nuisance and stand to fight. After about a good 10 min's Superman would realize that this man is truly unstoppable. It would be too late though, and Superman would fall.
Well thats how it go's, if you try to fight Juggernaut in a physical fight, you lose.
Spiderman once said "When you fight people like Juggernaut, you just have to learn when to lose", and it's true.