A last-minute volley from Clinton Morrison sent Crystal Palace to the top of the table as Leeds United were denied a draw in agonising circumstances at Selhurst Park.
The Whites looked set to snuff out the final perfect record in the division after defending superbly with ten men for much of the contest, but Morrison popped up with a winning volley two minutes into stoppage time.
Leeds made the trip to London in confident mood and David Healy saw an early shot saved by Gabor Kiraly.
Their good early work was undone 15 minutes in as Geoff Horsfield was dismissed for retaliating to a nibble from Palace defender Mark Hudson.
Palace struggled to take advantage of their numerical superiority, but Jobi McAnuff squandered a couple of chances prior to the interval - firstly heading wide from seven yards and then volleying high over the bar.
Palace defender Leon Cort carries an aerial threat at set pieces and he found space in the box at a corner but headed wide.
Leeds attacks were limited in the second half, but Shaun Derry should have punished his former club just before the hour when heading over from ten yards.
Mark Kennedy twice produced sweet strikes from distance which were well saved by Tony Warner, while James Scowcroft created room for himself inside the box only to shoot weakly at Warner.
Warner made a better save a minute from time as he acrobatically tipped over a shot from Dougie Freedman after the substitute had scampered clear of his marker.
The keeper was powerless deep into injury time as Morrison showed great strength to spin away from Matthew Kilgallon inside the box before planting a volley into the net.