"Obi-Wan knew the Sith would expect him to take up a defensive stance in an effort to keep them at bay. But he also knew that tactic would give him no hope to prevail -- he would be worn down until his guard slipped and then he would die, like Adi had. Surprise was his best bet for survival -- and perhaps his only chance. The two Sith fell back, startled to find Obi-Wan taking the offensive and surprised by the ferocity of his attack. Sabers hissed, their blades striking sparks from the walls, leaving half-melted scrapes and bubbling burns in their wake. The two Sith maneuvered to pin Obi-Wan against the wall -- but there was so little room in the corridor that they got in each other's way." --Star Wars: The Clone Wars: Darth Maul: Shadow Conspiracy
Obi-Wan Kenobi's sudden aggressive attacks and the confining corridor was to his benefit and their disadvantage, making it a highly circumstantial victory.
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However, Darth Maul did hold his own shortly against Mace Windu and Aayla Secura on a Mandalorian supply outpost, but that doesn't put Maul on Windu's tier: