Dean Cox warned Sydney they would need all 120 minutes to win their AFL game against St Kilda.
He was only out by about 19 minutes, as the Swans had to come from being behind for the vast majority of the match to prevail in a pulsating duel.
Jai Serong's snapped goal with 14 seconds left marked the first time Sydney had been in front since midway through the first quarter on Sunday evening at the SCG.
They won the next centre clearance to overcome an outstanding challenge from the Saints, 15.14 (102) to 15.12 (102).
Sydney trailled by 33 points in the second term and were below their best for a large chunk of the game.
They also lost key defender Tom McCartin to another concussion, after he backed into a marking contest and Liam Ryan cannoned into him.
