Nick Johnson added 15 points for the Wildcats (17-0, 4-0 Pac-12), who broke the old team mark of 16 straight victories beginning a season set in 1931-32.
Aaron Gordon helped out with 12 points as Arizona followed up a 79-75 win over UCLA Thursday to sweep a Los Angeles trip for the first time since the 2004-05 season.
The Trojans (9-7, 0-3) were led by Byron Wesley with 18 points.
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