Which melee champion can beat nasus in a 1v1 late game

Master Yi with thornmail probably

Yi gets immunity to attack speed and MS slows for 10 seconds and thornmail fully reflects nasus's Q

Just have him get ninja tabi + thornmail + some other armor item + damage items and nasus dies

Nasus isn't that tanky, it's just that wither screws over so many people and makes it seem like he's tankier than he actually is

Are we assuming the opponent plays intelligently and uses their dash to leave until Nasus's ult is finished, or is this assuming they have to stand right next to each other until one of them dies?

Any top laner who can deny Nasus farm early game. But assuming he's a 300 stack toplane killing machine, I'd say tank Aatrox or lifesteal/damage Xin Zhao.

well first off nasus is the definition of late game scaling, so depending on how late were talking it would be impossible.

secondly he has plenty of aggressive early counters which can both force him out and prevent him from becoming a late game threat like riven, sion, rumble, lissandra top laners.

but if you want to say based on all averages, id go with jax and trundle who have a solid chance at beating him. sion and aatrox maybe

Trundle if he's built right.