Oregon took an early lead and never trailed in a midweek win over Portland.
Anson Aroz drove in a pair and Michael Freund struck out seven over 6.0 innings in a 7-4 Ducks win over the Pilots Tuesday night at Joe Etzel Field.
Oregon (20-7) avenged a 15-5 loss to UP three weeks ago and earned a split in the season series.