Karness Muur vs Darth Vader

EU Legends Only

Muur in his prime possessing Celeste Morne's body and equipment

Random Encounter, no prep

20 meter starting distance at the Iron mines of Concordia

All-out fight

R1: A New Hope Vader
R2: Return of the Jedi Vader

Muur/Morne's prime is unclear, but given their performance against a heavily weakened Krayt and a considerably holding back Vader:

R1: Vader, good fight. While he won't be mentally hindered by Kenobi's presence, he's become complacent at this point and will likely struggle a lot to deal with Morne's attacks. That said, prior knowledge will give him the edge he needs.
R2: Vader handily.

Vader takes both rounds, though R1 is a closer fight than R2.