Can Superman defeat Thor?
Yes, definitely. Superman will not actually kill him but put him down. Thor is nothing besides a weak man without his hammer. Superman is more powerful than Thor in several ways. Thor fights using his mighty hammer whereas Superman, with deadly powers, mortal punch and heavy kicks. If Superman throws 100 punches in two seconds at Thor, then its a goodbye for the son of "Ordin". According to the Hero lists, Superman stands first, Hulk goes second and Thor the third. Putting the man of steel down is something incapable of doing.