Leadbitter on target in home win.
Grant Leadbitter was the Black Cats' hero when QPR visited the SoL in 2007.
The midfielder fired the winner after coming on as a second half substitute.
This win moved Sunderland four points clear at the top of the Championship and even closer to clinching promotion.
Roy Keane's side got off to the best start when skipper Dean Whitehead slotted home David Connolly’s through ball in the seventh minute.
However, goalkeeper Darren Ward brought down Dexter Blackstock, gifting QPR an equaliser as Martin Rowlands scored from the penalty spot.
Sunderland had to be patient in the second half as QPR, who were battling against relegation, defended well.
But the breakthrough came in the 76th minute when Leadbitter fired a right-foot shot into the corner from 20 yards after being picked out by Carlos Edwards’ free kick.
The win over Rangers was Sunderland’s fourteenth consecutive win in an unbeaten run of 17 games.