That put Leeds 2-0 up on aggregate but just before the break, a defensive mix-up between Leeds keeper Kiko Casilla and defender Liam Cooper allowed Derby substitute Jack Marriott to convert into an empty net with his first touch of the game. A minute after the interval Mason Mount put Derby 2-1 up with a fine finish after a clever touch from Harry Wilson, who made it 3-1 on the night with a 58th-minute penalty.
Yet Leeds were able to get back on level terms on aggregate with a fine effort from Dallas in the 62nd minute. Leeds went down to 10 men though in the 78th minute after Gaetano Berardi was dismissed after a second yellow card for a late lunge on Bradley Johnson.
Wilson hit the post for Frank Lampard's Derby in the 84th but moments later Marriott grabbed the decisive goal with a clinical finish after good work from Richard Keogh. (Reporting by Simon Evans Editing by Toby Davis)
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