San Francisco (9-11, 2-5 West Coast) won despite collecting just 17 rebounds.
The Dons made up for that discrepancy in other areas, hitting 16 of 17 free-throw attempts and building a 35-16 scoring advantage off the bench.
Dickerson hit three 3-point field goals and had three steals. Cody Doolin had seven assists.
Portland (8-13, 1-5) had a 37-33 lead at the half. It outscored USF 32-24 in the paint and had an 11-7 edge in second-chance points.
The Big 12/SEC Challenge will again feature Kansas and Kentucky, this time at Rupp Arena. That's not the only exciting matchup in next season's midseason conference showdown.
Northwestern has never made the NCAA tournament, but the Wildcats' upward trajectory suggests 2016-17 could finally be the season it happens.
Dillon Brooks, who led Oregon with 16.7 points per game last season, will opt out of the NBA draft process and return to the Ducks, a source told ESPN.