Lee caught 16 passes for a Pac-12-record 345 yards and two touchdowns to help USC (6-2, 4-2 Pac-12) build a 15-point lead midway through the third quarter.
But Scott led Arizona (5-3, 2-1) back, throwing for 369 yards and three touchdowns, including a 7-yarder to David Richards that put the Wildcats up 39-28 with just over 5 minutes left.
The Trojans answered quickly with Silas Redd's second rushing touchdown, from 10 yards, but remain stuck on 799 wins as a program after Matt Barkley's last-ditch pass into the end zone was swatted down.

Arizona quarterback Matt Scott (10) hands off the ball to Ka'Deem Carey (25) during the first quarter of an NCAA college football game against Southern California at Arizona Stadium in Tucson, Ariz., Sat., Oct. 27, 2012. (AP Photo/Wily Low)
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