QPR's Garry O'Neill has received a red card after committing a professional foul on the edge of the Derby County penalty area.
The QPR defender was deemed to have brought down Johnny Russell when he was clean through on goal.
Jamie Ward failed to make the most of the resultant free-kick, but Steve McClaren's men now have the upper hand in this tense final.
Derby County players and fans are thanking their lucky stars as QPR's Charlie Austin looked to have squandered the best chance of the match, firing inches wide of the right-hand post.
Harry Redknapp's men are enjoying a good spell at the moment, after Derby enjoyed the best of the possession in the opening stages of the second half.
There have been no changes made by either manager as the second half of the play-off final at Wembley gets underway.
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Derby County are level with QPR at half-time, in a goalless game so far.
Both sides are struggling to gain a foothold and impose themselves on the game, with very little in front of goal so far.
Second half to follow...
Derby County's Will Hughes has had a penalty claim turned down, as he cut into the penalty area and gave the QPR defence some problems with his quick turn of foot.
The Rams are beginning to impose themselves on game as they look to gain an advantage in the tie before half-time.
QPR though are looking dangerous on the counter-attack, with Junior Hoilett causing the Rams defence some problems.
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The opening fifteen minutes has been played out without a shot on target by either side, with QPR having the majority of the possession.
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Derby County have kicked off their play-off final battle with QPR with a place in the Premier league up for grabs.
The Rams are playing in their home-kit for the encounter, whilst QPR are wearing their away strip of red and black.
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