Leeds were denied a penalty in the opening exchanges when Dan James was felled by Matt Ritchie who volleyed the back of the winger's leg as he looked to clear in a crowded box. Referee Robert Jones appeared to think about it but waved play on, much to the fury of United's players.
A fine double save then denied Daniel Farke’s Whites, Nicolas Schmid keeping out Manor Solomon's firm low shot in a tightly packed box before also thwarting Joel Piroe's attempt on the follow up.
An absolutely glorious Leeds chance was then squandered early in the second half as Piroe skied a shot over the bar from close range after being perfectly teed up by Solomon’s cutback.
But Pompey remained a threat at the other end themselves and John Mousinho’s side bagged what proved the only goal of the game in the 61st minute as Colby Bishop was played in down the left channel before advancing on and beating Illan Meslier with a neat finish.
Even then, more golden Leeds chances were wasted, Junior Firpo unable to beat Schmid when one on one and a Firpo header crashing back off the bar. One final chance in the 96th minute then led to one final excellent Schimd save to tip a Sam Byram header over the bar.
Graham Smyth, the YEP’s chief football writer, hands out the scores from a defeat which has left Leeds only top of the division on goal difference.

13. Largie Ramazani (sub)
5 - One good cross but lost his first battle and took time to get into it. Photo: Matt McNulty

14. Mateo Joseph (sub)
5 - Tried to unsettle defenders but the ball never really came to him in positions where he could hurt Pompey. Photo: Naomi Baker

15. Sam Byram (sub)
5 - Came close with the late header but otherwise found himself in a bit of a scrap on the right. Photo: Robbie Stephenson

16. Willy Gnonto (sub)
5 - Thrown on in a really attacking formation, buzzed around to try and make things happen but it was too much of a scramble. Photo: George Wood

17. Robert Jones (referee)
3 - Missed a penalty, should have produced a yellow for the challenge on Meslier, otherwise a bit inconsistent with his cards. Photo: Richard Heathcote