The Foxes opened up a crucial advantage in what has been a fascinating battle at the top of the Championship by hammering fellow promotion hopefuls Southampton 5-0 at the King Power Stadium on Tuesday night.
That opened up a four-point lead over second-placed Leeds and a five-point advantage over Ipswich Town, meaning that defeat for the Whites in their penultimate game of the campaign would rubber-stamp Leicester's promotion before they even kicked another ball.
All three teams in the top-two mix have faltered at times in recent weeks, but Leeds were still regarded as favourites to beat a QPR side still not certain of their place in the Championship next season prior to kickoff.
However, Marti Cifuentes's side took the lead after only eight minutes at Loftus Road and never looked back, sweeping Leeds aside to not only confirm Leicester's promotion but also deal a huge blow to their visitors' own promotion bid, while confirming their survival in the process.
Ilias Chair got that early goal for the hosts, before Lucas Andersen doubled QPR's advantage midway through the first half to leave Leeds with a mountain to climb if they were to avoid dropping valuable points.
The visitors had chances to claw their way back into the game, most notably through Georginio Rutter and Crysencio Summerville, but could not find a way past Asmir Begovic in the QPR goal.
Lyndon Dykes then put the result beyond doubt with a third for his side 17 minutes from time, before things got even worse for Leeds when Sam Field rose
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