Harris shot 14-of-18 and tallied seven rebounds.
The Magic snapped a 10-game losing streak in Borrego's coaching debut. Nikola Vucevic added 25 points and 13 rebounds. Victor Oladipo scored all 12 of his points after halftime and finished with 11 boards and five assists.
Los Angeles lost for the 12th time in its last 13 games despite holding a double-digit lead early in the fourth quarter.