What happened: Mackenzie Dern won the vacant strawweight championship by unanimous decision over Virna Jandiroba at UFC 321 on Oct. 25, 2025. She dedicated the victory to her daughter, Moa.
Why it matters: Dern returns at UFC 330 with the belt at stake for the first time. The co-main event matches her grappling against Robertson, the UFC women’s submission leader.
By the numbers: Dern enters at 16-5 with eight submission wins and six first-round finishes. Robertson is ranked No. 5 in the strawweight division.
What to watch: Dern and Robertson meet Saturday at Philadelphia’s Xfinity Mobile Arena, with the main card starting at 9 p.m. ET.