Two-weapon fighting, sure, but single-weapon with no shield? I'm not sure if that would fall under a classic choice. I can't think of a single armored hero from the last thirty years who routinely goes into combat against armed opponents while leaving one hand empty, unless they're using that other hand to cast spells.
Or to brawl. Knock a foe prone. Grapple him. You now have advantage until he escapes and he has disadvantage. Granted, this does not work against huge foes unless the melee PC is increased in size some way. For example, Enlarge/Reduce not only ups a PC's size to Large, it also increases weapon damage by 1D4 and gives him advantage on Strength checks which makes it easier to knock foes prone and to grapple foes in the first place. The Grappler feat makes this much better against larger foes because they no longer auto escape. And moving grappled foes automatically is a tactic that is probably missed at most tables.