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Leeds dominated the first half in front of a raucous Elland Road crowd, but wasted a host of chances to break the deadlock. Everton, on the other hand, did not muster a single shot, on or off target, in the opening period.

The visitor brought on close season arrival Jack Grealish as it improved after the break, but James Tarkowski's handball gave the host the opportunity to snatch victory six minutes from time.

Nmecha, a free transfer ahead of the new campaign, stepped off the bench to emphatically convert from the spot, ensuring Leeds, back in the top flight after a two-year absence, got its season off to the perfect start.