Altough he's one of my favourite heroes, he can't.
He has trade blows with him on various occasions, when Juggernaut take over the world where Thor teleported him after their first fight, Thor was able to stop for a while Cyttorak's magic:
From The Unstoppable Juggernaut Homepage
Thor had sent Mjolnir circling the castle to negate all mystical energy. This wiped out The Juggernaut's invulnerabilty and forcefield which Cain found out the hard way when a crisp Thor right cross hit him in the face so hard it tore up his helmet and knocked him for a loop.
Still stunned at suddenly being vulnerable and touchable The Juggernaut renews his attack regardless. The Mjolnir cyclone obviously couldn't negate ALL of The Juggernaut's mystic energy as The Juggernaut still had an immense amount of strength left and puts Thor down and on the ropes with just one punch. Seeing The Juggernaut's next crushing and perhaps finishing blow coming at him Thor musters enough strength to dodge and go on the offensive.
Able to now lay hits on The Juggernaut and being a much better hand-to-hand combatant Thor rains blow after blow on The Juggernaut. Hitting him across the face and following up quickly with a vicious blow to his stomach rapidly,not allowing The Juggernaut any time to regain his bearing. Thor actually manages to daze him but The Juggernaut refuses to fall stating defeat is not in his vocabulary. Thor cocks back to throw what he feels will be the finishing blow but right before it connects The Juggernaut's forcefield comes back and deflects it. 60 seconds having expired which means Mjolnir had to return to Thor's hand. Thor's valiant effort goes for naught as The Juggernaut recovers completely from the barraging assault the instant his protective spell returns.
Sensing that trying to actually fall The Juggernaut is impossible Thor devises a way to remove the unstoppable menace. Thor begins twirling his hammer to create a powerful windstorm. The Juggernaut effortlessly walks through it towards him and says he going to rip Mjolnir right out of Thor's hands and bash Thor with it. But when Cain reaches out to grab Mjolnir Thor wraps Cain's wrist in the hammer's unbreakable band. Thor then flings his hammer(with The Juggernaut attached) into space onto a meteor. Not sure why The Juggernaut didn't just pull his hand out or ride the hammer back,but there ya go.
Originally posted by K3VIL
Thor always speak about being a honorable combatant, a great fighter, a paladin etc. but isn't the teleporting you in another world trick cowardish?I mean, Juggy conquered the world where Thor sent him after their first fight, indeed, it was all Thor's fault if that realm was take over.
Yes, in my opinion it is cowardish. Fight with other pwoers, excluding teleportin, fight him like a man.