Wycombe's hopes of claiming an automatic promotion place in League One suffered a major setback as they lost 1-0 at Reading.
With second-placed Wrexham beating relegation-threatened Burton, also in an early kick-off, Wanderers now trail the Welsh side by six points, albeit with a game in hand.
Wycombe dominated a spiky first half but it was Reading who made the breakthrough through a Harvey Knibbs penalty in the 77th minute.
That proved enough for Reading to extend their unbeaten home record to nine games.
Wycombe had made a lively start, with Adam Reach attempting an audacious 20-yard lob, only for home keeper Joel Pereira to claw it away for a corner.
Sonny Bradley headed over from a Luke Leahy cross and Reach tested Pereira from distance as the visitors continued to dominate.
Reading offered little going forward and the cross-border Berks-Bucks rivalry threatened to spill over with a series of niggly challenges from both sides.
Chairboys keeper Will Norris was forced into action for the first time early in the second period, saving a header from Mamadi Camara.
But it was Pereira soon to the fore again at the other end, superbly tipping over a firmly-headed effort from former Royals winger Garath McCleary.
Thirteen minutes from the end, Cameron Humphreys clumsily fouled Chem Campbell in the area and Knibbs slammed in his 16th goal of the season from the spot to settle the outcome.
Match report supplied by PA Media.
"The players don't deserve what's happened this week" - Wycombe boss Mike Dodds (BBC Three Counties Radio)
