Duel at unidentified Outer Rim spaceport/Legends

A lightsaber showdown took place between two Jedi and the Nightbrothers Darth Maul and Savage Opress, around 20 BBY on the planet Stobar.

Prelude
The exiled Sith Apprentice Darth Maul resurfaced on the planet Lotho Minor in 21 BBY, committing various acts of violence and sabotage throughout the Outer Rim with the help of his brother and rogue Sith Acolyte, Savage Opress. These acts included a massacre of the innocent on the planet Raydonia and an attempted conquest of the planet Moorjhone; the Jedi Order actively pursed the brothers.

The duel
The Nightbrothers eventually crossed paths with the Jedi in a spaceport on the planet Stobar. Opress dueled an unidentified Nikto Jedi while Maul confronted Finn Ertay, a female Twilek. Savage, with his brute strength, beat down the Nikto, knocking the wind out of him. Just as Opress was about to deliver the killing blow, Ertay jumped in the way and blocked the blow with her lightsaber; however, Maul used the momentary distraction to come up behind the preoccupied Jedi and stab her with his saber. The Nikto soon followed.

Behind the scenes
The showdown on Stobar briefly appeared in the fifth season premiere episode of The Clone Wars animated series, showing the death of Finn Ertay at the hands of Darth Maul. The trivia gallery on the official website of the series confirms Ertay's identity, the setting of the duel, as well as the fate of the Nikto Jedi.