Sophomore Joshua Charlton beat No. 29 Gabriel Decamps (UCF) in Wednesday's first round.
The UO senior will face Pacific's Philip Hjorth in the Duck Invitational final Sunday at 11 a.m. (PT).
Play resumes Saturday at 9 a.m. (PT) at the Student Tennis Center.
Senior Ty Gentry won the 'A' flight of the Duck Invitational last year.
Oregon has won the last three doubles titles at the ITA Northwest Regional Championships.
Junior Emmanuel Coste beat a pair of Pac-12 opponents to advance at the ITA Northwest Regional tournament.