Marcelo Bielsa's side were made to pay for two costly mistakes and a lack of cutting edge in South Wales as the Whites made a losing start to the nine game run-in. Take a look back at the match action in pictures below from the Cardiff City stadium.
7. Behind closed doors
It was the first game for either side behind closed doors as the Championship campaign resumed.
8. Leeds look to reply
United continued to dominate despite the opener but failed to work any clear cut chances... until Harrison saw Bamford inadvertently block an effort on the line.
9. Cardiff score
But it was the Bluebirds who opened the scoring after a mistake from Kalvin Phillips allowed Junior Hoilett to fire home from distance.
10. Leeds dominated early
Marcelo Bielsa's side were in control early on as they shifted through the gears...
11. Costa has no joy
Helder Costa tries to find a way through the City defence before the hosts double the advantage in the second half from another mistake at the back.
12. No cutting edge
Leeds continued with more pressure but lacked a cutting edge in the final third to open up Neil Harris' men.