If Logan with Adamantium can get ko'd and beaten down, so can Creed without it.
And going by feats Cap is physically superior to Origins Sabretooth. 3 movies full of insane strength/speed/durability/agility/skill feats that frankly blow Creed out of the water. He's stronger, faster, more durable, better in a fight, etc...
As for the claws, they could pose a problem, but see his knife fight with Bucky to see how he handles people with blades. He can't disarm him...well technically he could just cut his arm off. But he's a helluva lot faster than Victor and he'd be wary of those claws. He might even snap them off with the shield.