Adel Taarabt's first-minute strike was enough to earn QPR a win over Barnsley, putting them within touching distance of promotion to the Premier League.
Taarabt's low strike on 47 seconds maintains QPR's 10-point lead at the top of the Championship.
Barnsley battled for a route back into the game and Barnsley's Jacob Butterfield came closest to equalising when his long-range drive hit the post.
But QPR remained resilient and held on for another three points.
Following their shock defeat at Scunthorpe on Saturday, QPR bounced back in emphatic fashion, catching Barnsley cold at Oakwell.
Predictably it was Taraabt with the goal, fooling the Barnsley defence with a step-over and blasting beyond Luke Steele.
Barnsley responded well to the early setback and were the dominant side throughout the first half but Danny Haynes and Marlon Harewood were guilty of missed opportunities as Kaspars Gorkss starred at the heart of Rangers' defence.
Both sides were lucky to end the first period with 11 men, Taarabt fouling Butterfield and receiving a yellow card, only for the Barnsley man to retaliate shortly afterwards and pick up a booking for his troubles.
QPR's Tommy Smith tapped in from close range on 55 minutes, only for it to be chalked off for offside before Butterfield's excellent effort from distance hit the outside of Paddy Kenny's post.
But QPR held on for a win that could see them tentatively celebrate promotion to the Premier League with a victory in their next game against Derby. The club could be docked points nearer the end of the season however, as they await a disciplinary hearing after being charged with breaching Football Association player ownership rules.