William's 202 yards were a career-high while his 40 carries ranked second among all-time Auburn carriers trailing only the 41 he rushed for against Georgia.
Walter Reyes played hero temporarily for the Orangemen sending the game into triple overtime with a 2-yard touchdown run.
The game, tied at 24, went into overtime where the two teams missed field-goal attempts.
No. 25 Auburn (4-3), scored when it needed to after Collin Barber nailed a 44-yard FG to start the third period. But the Tigers began to advance the ball up field.
Tiger reserve QB Jason Campbell threw to Lorenzo Diamond for 11 yards and then let Williams work. to end the game.
Campbell entered the game in the second half after starter Daniel Cobb twisted an ankle.
Carlos Rogers threw a pair of third-quarter picks but it didn't matter against Syracuse's atrocious defense. Despite taking a 17-3 halftime lead, the Orangemen couldn't get a first down 20 minutes through the second half.
That allowed Auburn to take it's first lead when fullback Brandon Johnson found himself wide open in the Syracuse secondary and ran the ball in for a 34-yard score from Campbell with just over seven minutes left. It was the first catch Johnson had collected this year.
Then, starting QB R.J. Anderson, who had completed just 5-of-18 passes for 67 yards and three picks was lifted in favor of backup Troy Nunes.
Nunes was brilliant on the drive completing 7-of-8 passes capping an 80-yard drive with a 2-yard strike to David Tyree with 23 seconds left in the game. Barber came on to put home the extra point, which proved crucial after Auburn had botched the previous extra point.
The first half scoring for the Orange came from an 85-yard punt return by Jamel Riddle and on Reyes' 68-yard gain.
The loss dropped them to 0-3 against Div. I teams.
Auburn Tops Cuse In 3OT
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