UCLA (14-3, 4-1 Pac-10) inched closer to the hosts and managed to nearly close the gap, trailing 27-25 at halftime.
The Bruins grabbed their first lead of the game, 29-27, at the 17:22 mark of the second stanza. Cold shooting beyond the arc plagued the Sun Devils, as the hosts increased their lead to double digits.
However, ASU was able to turn the tables and stifle the UCLA offense once again. Harden scored 17 points in this period and his two free throws with 22 seconds left in regulation sent the game into the extra period.
Jeff Pendergraph opened overtime with a dunk which was ultimately a sign of things to come. Harden, saddled with four fouls now, gave ASU a 59-58 lead with 35 seconds left, a lead the Sun Devils managed to dearly hold onto and notched their first win against UCLA in five years.
Harden led all players with 24 points, 19 of them coming in the second half and overtime. Pendergraph chipped in with 18 points and had a game high seven rebounds. Josh Shipp paced the Bruins with 16 points.
ASU edged UCLA on the boards 26-25. They were just 3-17 beyond the arc, but shot 82.4 percent from the line.
ASU's toughest stretch of the season ends with a third consecutive road game, a trip down south to archrival Arizona on Wednesday. This contest is naturally always a significant one on the maroon and gold's schedule and a victory in Tucson will help the Sun Devils stay in the upper echelon of the Pac-10 standings.