Thor has already beaten the Silver Surfer several times in the comics. The first time they fought in the classic Silver Surfer #4, Surfer even flat out states, "I have seen his mallet's magic! It is truly mightier than my cosmic force!" Then in the Blood and Thunder story arc, Thor knocks out the Silver Surfer even after Surfer says he's not going to hold back. When Surfer wakes up, he gets help from Adam Warlock, but then Thor beats Surfer and Warlock at the same time and they have to flee. The Silver Surfer is easily one of Marvel's most powerful heroes, but Thor is just a bad matchup for him. Thor can absorb Surfer's energy attacks with Mjolnir while Thor is just a much better melee fighter than Surfer.