Second-half goals by Conor O’Donnell and Patrick McBrearty returned Donegal to the Ulster final.
O’Donnell and McBrearty hit the net in the final ten minutes as Donegal overcame the Breffni 2-16 to 0-16 in Clones.
Cavan led 0-8 to 0-5 at one stage in the first half.
They teams were level 0-9 apiece at half-time and it was still all square, 0-14 all, before O’Donnell superbly finished from close range.
McBrearty blasted home when Niall O’Donnell’s ball dropped short.
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