One of the most gifted duelists in the history of the Jedi Order was Mace Windu, a champion of the Jedi Order during the final days of the Jedi. He was a skilled warrior who mastered the art of using his rage and anger in a fight without having to dive deep into the dark side of the Force. As such, he was strong enough to defeat Darth Sidious in a straight-up lightsaber duel.
In the canon storyline of Star Wars, Windu was the only one to ever defeat Palpatine in a lightsaber duel. While some fans would think that Palpatine allowed himself to be beaten, this was never confirmed. That means that Mace Windu was strong enough to best one of the strongest lightsaber duelists in the entire canon storyline. As such, he would have been strong enough to defeat Darth Vader in a duel.
Mace Windu's journey as a Jedi Master reveals much about the balance between light and dark sides of the Force. His combat techniques not only showcased his physical prowess but also his mental fortitude. Windu was known for his unique fighting style, a blend of traditional Jedi techniques enhanced by his ability to harness his emotions without succumbing to the dark side. This skill set was essential in his fateful duel against Palpatine, marking a pivotal moment in the Clone Wars era. Furthermore, the implications of Windu's victory resonate deeply within the Star Wars narrative. If Windu had survived his encounter with Palpatine, the outcome of the Galactic Empire might have been dramatically different. Fan theories often speculate on the potential of a revived Jedi Order led by Windu, effectively shifting the balance of power in the galaxy. His legacy continues to inspire discussion among Star Wars enthusiasts, highlighting the untold potentials of one of the most formidable Jedi in the lore.