THE bad blood between these sides is threatening to boil over after Spygate was followed by the penalty that never was in the first leg of the play-off semi-final.
Forget about peeking over fences to snoop on training sessions, Saturday's controversy was all about who had the best view of that spot-kick shout.
Ref Craig Pawson initially awarded Derby a penalty when Jack Harrison tangled with Jayden Bogle in the box, only to reverse his decision on the advice of assistant Eddie Smart.
Rams boss Frank Lampard was smarting over that call, branding the decision “astounding”, and he now needs a massive result from his players to overturn that 1-0 loss at Pride Park.
Leeds were well worth the victory provided by Kemar Roofe's superbly-worked strike and it looks like the pain of missing out on automatic promotion has made them hungry to make amends via the play-offs.
Their fans certainly savoured the win at Pride Park, taunting Lampard by signing ‘Stop Crying Frank Lampard' to the tune of ‘Stop Crying Your Eyes Out' by Oasis.
And I've a feeling the Rams boss will be left greetin' again after the Elland Road return when Marcelo Bielsa's side should finish the job.
These teams have faced off three times this season and the aggregate score is 7-1 in Leeds' favour after three victories for the Yorkshire club.
Leeds are a best 77/100 with Marathonbet to win again on the night but you can get better odds by doubling it with both teams to score at 5/2 with William Hill.
Derby have drawn a blank twice against Leeds this term but I've a feeling they will score here as they go all out to keep their promotion dream alive.
The last two meetings between these sides have been tasty affairs, with five bookings in Leeds' 2-0 win at Elland Road then another seven last weekend.
Backing over 4.5 cards came up for me when these sides last faced off in Yorkshire and I fancy a repeat at 5/6 with Bet 365. A red card also wouldn't surprise me and it's 7/2 with the same firm while Paddy Power offer a whopping 35/1 on both sides having a man sent off.
First-leg goal hero Roofe has now netted four times against the Rams this season but he has been ruled out of the return with a calf strain. Patrick Bamford, back after his suspension for deceiving the ref in the stormy game against Aston Villa, should deputise and is 7/5 with Betfred for anytime scorer.
Derby hope to have striker Martyn Waghorn back from injury while veteran left-back Ashley Cole could also feature after recovering from a groin problem.
But Harry Wilson looks the best bet for a Rams strike, given his prowess from set-pieces. He's 4/1 with Paddy Power for anytime scorer and a tempting 11/1 with Unibet to net from outside the area.
This England Championship match between Leeds United and Derby County will be played on May 15, 2019 and kick off at 19:45. Check below for our tipsters best Leeds United vs Derby County prediction. You may also visit our dedicated betting previews section for the most up to date previews.
