Leeds eased past Millwall 3-0 thanks to Joel Piroe's double and a well-taken goal from Georginio Rutter as Daniel Farke's side earned their second win of the Championship season.
The 15th-minute opener was shrouded in controversy, with the hosts aggrieved a foul was not given on Kevin Nisbet in the build-up, before Piroe raced downfield, linking superbly with Wilfried Gnonto and Rutter, and dispatched a cool finish.
Scorer Piroe was actually the one to collide with Nisbet, which referee Chris Kavanagh deemed to be merely a coming together - an incident Millwall failed to recover from, prompting somewhat of a second-half collapse.
Gary Rowett's side emerged from half-time in better spirits, but failed to truly test a less-than-comfortable Illan Meslier, other than a tame Tom Bradshaw strike. The Leeds goalkeeper had flapped at a few set-pieces, but Millwall failed to capitalise.
Two quick-fire goals in the space of four second-half minutes then sealed the Londoners fate, scored by Piroe (77) and Rutter (81), to ensure Leeds rise to 10th in the table thanks to a performance with all the hallmarks of a genuine promotion contender.
Millwall, meanwhile, slip to a disappointing 18th.