West Brom striker Simon Cox denied QPR a memorable victory with a 94th-minute equaliser which saved the Coca-Cola Championship high-flyers from a second successive home defeat and salvaged a 2-2 draw.
For all Albion's dominance they failed to punish the visitors and a Jonas Olsson own goal was quickly followed up on the hour by Kaspars Gorkss' header.
But West Brom never gave up and Jerome Thomas pulled them level before Cox's late intervention. The result leaves Rangers without a win in eight games while second-placed Albion have stretched their advantage over the chasing pack to four points.
QPR manager Jim Magilton was absent for the first time following his suspension pending an internal investigation into an incident at Vicarage Road last week involving Akos Buzsaky. The Hungary international was not in the matchday 18 at The Hawthorns due to injury.
Rangers keeper Radek Cerny endured a nightmare start as he made a complete hash of three attempted clearances. But he was not alone in looking unsettled as the majority of his team-mates looked at sixes and sevens during the opening stages, where Cox and Thomas both spurned opportunities to give the Baggies the lead.
The visitors barely managed to get out of their own half in the early stages of the second half but some stout defending and a lack of quality in the final third ensured it remained goalless.
And West Brom were made to pay for their wastefulness in front of goal in the 56th minute. Ben Watson whipped in a corner and Olsson, under pressure from Gorkss, diverted an unfortunate header over Graham Dorrans on the line and into the top corner.
The visitors doubled their advantage just after the hour mark. Watson floated a free-kick goalwards from a central position which evaded everyone. Yet Kiely could only palm the ball into the onrushing Mattock and it subsequently fell for Gorkss to head into an empty net.
Out of nowhere the game had exploded to life and West Brom reduced the arrears just five minutes later when the Rangers defence failed to clear Chris Brunt's knock down and Thomas pounced to smash home his sixth league goal of the season.
Albion applied a host of pressure in the closing 15 minutes with Gianni Zuiverloon's header clipping the outside of a post and Cox forcing a great stop from Cerny. And it was the latter who rescued a dramatic point for West Brom when he pounced from close range deep into injury time.
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