LOS ANGELES (AP) -Britain Covey caught two touchdown passes for the Utes (6-1, 3-1), whose eight-game winning streak ended.
Smith, USC's dynamic freshman linebacker, led a fine defensive performance by picking off Travis Wilson's throws and making three returns for a combined 122 yards, including his scoring romp down the USC sideline 1:07 before halftime.
Utah was second in the nation in turnover margin entering the game, forcing 19 turnovers and committing just seven. The Trojans erased that advantage thanks to Smith, the first USC player with three interceptions in a game since Jason Oliver in 1991 against Penn State.