Revan simultaneously holds the most powerful Sith Lord in the galaxy at bay for 300 years, while being tortured, and while seeding his thoughts with peace
Now let’s talk combat, first of all he’s a Jack of All trades being adept or an expert in all forms of saber combat. Notable fights are of course against Darth Malak beating his ass twice. Then against about 3 Sith Lords and 3 Sith Masters one including Satele Shan the current eras Grandmaster, and Darth Marr the current eras head of the Dark Council. Now let’s talk powers again he’s a jack of all trades being able to use light and dark side abilities proficiently, his lightsaber style that he uses gives him the opportunity to use his force powers in tandem with saber combat making him far more dangers in cqc. For durability this got not only tanked a lightning from a powerful Sith Lord but he absorbed it and redirected it back tenfold, completely atomizing her. So with Psylocke not being able to infiltrate his mind and TK being childplay to someone like Revan, it all comes down to sword fighting, which because Revan can use the force with combat. He's getting underestimated here lol