Two goals in three minutes either side of half-time were enough to see Didcot through to the semi-finals of the Complete Music Challenge Cup.
There was little between the teams in the first half. Didcot's Simon Kelly was inches away from a Matt Bianchini's cross, while North Leigh's Greg Sawyer missed the target with a free header.
Andy Cooper rattled the North Leigh crossbar from a Rod Dorrian corner, and just before the end of a first half that contained too many niggling fouls, Didcot struck. Bianchini's deep cross fell to Jamie Copping, who crashed a drive into the top corner.
Didcot increased their lead shortly after the interval when Simon Kelly broke down the middle and beat keeper Kevin Alder.
North Leigh's Sean Bott hit a shot over Alex Deadman's goal from ten yards out, and the unmarked Sawyer then placed his header wide, but after that, Didcot always looked more likely to score.
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