Glenn Murray scored twice against former club Brighton to clinch a memorable derby victory which sent Crystal Palace to the top of the npower Championship.
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The game-changing moment came after just eight minutes at Selhurst Park as Seagulls defender Lewis Dunk lost possession and saw red for bringing down the impressive Yannick Bolasie.
Owen Garvan hit the resulting free-kick against the crossbar but it was only a matter of time before the dominant Eagles broke the deadlock as Murray, who switched between the fierce rivals 18 months ago, headed home Bolasie's corner.
Craig Mackail-Smith should have levelled matters immediately after half-time but could only hit a post when clean through, and the miss proved crucial as Tomasz Kuszczak brought down Murray in the penalty area and the striker stepped up to fire home his 17th goal of the season from the spot.
Matters went from bad to worse for the Seagulls in the 71st minute as Gordon Greer fouled Murray in the area, and with the Palace striker having previously missed two penalties this season when looking for a hat-trick, it was Garvan who converted from 12 yards.
Close to 50 miles may separate the two sides, who had only met six times in the past 10 years before today, but that will not ease the pain of defeat for Brighton, who have also seen their seven-match unbeaten run come to an end.
Impressive Palace, meanwhile, have now lost only one of their last 17 and are unbeaten on home soil since the opening day, with Eagles fans able to enjoy top spot for at least 24 hours until second-placed Cardiff host Sheffield Wednesday tomorrow.
There can be no doubt the early dismissal played a huge part in the game.
The visitors dallied with the ball at the back and paid the price as Bolasie nicked in to grab possession, with Dunk sent off for subsequently bringing down the Palace forward when clean through.
Garvan almost doubled Brighton's punishment but his resulting free-kick hit the top off the crossbar.
As you would expect, Palace were doing all of the pressing and Bolasie and Garvan both tried their luck from distance before Kagisho Dikgacoi fired straight at Kuszczak.
Palace's pressure finally paid off in the 38th minute.
Bolasie's inswinging corner was met by the head of an unmarked Murray, back from a one-match suspension, and he made no mistake from close range.
Julian Speroni had had next to nothing to do all half but he reacted superbly to keep out Ashley Barnes' flicked header.
Brighton's best chance came with just 62 second-half seconds on the clock as Wilfried Zaha, for all his impressive trickery, lost the ball in the middle of the park and Mackail-Smith was sent clear but could only find the outside of a post.
And the miss proved crucial as Palace doubled their advantage after 54 minutes.
Kuszczak brought down Murray in the penalty area and the striker picked himself up to score from the spot.
Murray headed narrowly over with a hat-trick at his mercy but it was soon three-nil as Greer inexcusably hauled down Murray, leaving Garvan to fire home the resulting penalty from 12 yards.