Donegal exited the Ulster Under 20 Championship at the Semi Final stage on Friday night losing out 3-10 to 1-11 to Monaghan. Gary Duffy's side led nine points to 1-01 at half time but were outscored 2-09 to 1-02 in the second half to bow out of the Championship. Donegal manager Gary Duffy told Oisin Kelly his side just didn't kick on in the second half.