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In this March 3, 2018, file photo, Arizona guard Allonzo Trier (35) scores against California during the second half in Tucson. Trier was selected to the AP All-Pac-12 team on Tuesday, March 6, 2018. (Rick Scuteri/AP, File)

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Preview: Arizona No. 1 seed at Pac-12 tourney after tumultuous year

College Basketball: Pac-12 Tournament

LAS VEGAS — Arizona’s season started under a dark cloud following the arrest of assistant coach Emanuel Richardson as part of a federal probe into shady recruiting practices.