Jedi
Canonically, all Jedi are precognitive. That's how they can deflect blaster bolts which otherwise go too fast for humans to track. What happens when they fight?
Generally the answer is "boss fight"! But more than that, the winner is generally determined by how skilled they are at fighting. Knowing the future is one thing, but being able to physically move your blade in time, or position yourself on terrain so that you have the advantage, those are skills which give you the edge.
Sherlock
In the BBC series Sherlock,Sherlock Holmes isn't truly precognitive. Rather, he has a superhuman ability to extrapolate. In the episode The Reichenbach Fall, he faces an opponent who is similarly able, and the pair both mentally track a fight which ends with Holmes's defeat. They both know the outcome. Holmes then takes an alternative option of going over the Falls together, faster than the other man can react.
A general case for precognition here would be that your precognitive skills can only cover what you focus on. They don't cover left field attacks (or defences) which you don't know to think about.
