Donnell McNeilly's only previous professional goal came for Chelsea U21s in the EFL Trophy last season
Wycombe continued their winning start under new manager Michael Duff with a deserved Carabao Cup triumph at fellow League One side Wigan.
Former Huddersfield boss Duff took charge of Wanderers last week and saw his side win for a second time, at a largely empty Brick Community Stadium.
After an early six-minute stoppage when an assistant referee went down with an injury, Ollie Cooper went close for Wigan with a powerful shot.
But Wycombe dominated possession throughout and went ahead just after the half hour when Caolan Boyd-Munce scored his first for the club with a lovely left-footed curler from the edge of the area.
Will Aimson had a great chance to level for Wigan but slid in and scooped over from close range as the hosts failed to have a shot on target all night.
And, after the break, on-loan Nottingham Forest forward Donnell McNeilly headed in to send Wanderers into the fourth round.
His header means Duff's new side have already had 14 different goalscorers this season.
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