Portadown seconds’ unbeaten run was cut short on Saturday as Donegal picked up a 9-8 success.
Playing conditions proved difficult and early Portadown pressure failed to produce a reward.
A penalty arrived off Neil Irwin following six collapsed scrums on the Donegal line.
In contrast, the home side managed to convert three penalties.
Portadown moved the ball via the forwards to create space for Calvin Chambers to cross the line.
Johnny Hampton was selected as Portadown’s leading player and thanks go to Shelbourne Motors for sponsorship support.
Portadown thirds enjoyed a return to winning ways by beating Limavady on a 26-22 scoreline.
Barry Gribben kicked two conversions to enhance points provided by tries from Ross Davies and Aaron Morton.
Portadown raced clear by 19-0 on 20 minutes. Chris Dunn’s solo run and finish proved just one highlight.
Emmet Murphy and Craig Woods helped to lead the defence, with the experienced Gribben capping his commanding display with a try off approach work by Jonathan Allen, Matthew Beale and Ryan Duffy.
Limavady hit back after the break as 22 points without reply cut the gap before the final whistle signalled success for Portadown.
Portadown fourths celebrated a first Chambers Park appearance of the campaign by beating Civil Service.
Ruairi Quinn posted two tries, with Jamie Matthews and Brian Milligan also on the scoresheet.
The side featured a mix of youth and experience thanks to work by Sid Johnson, Paul Galway and Clive Bowles.
The experience of Darren Preston and Brian Milligan helped Portadown gain control, with Kenny Anderson picking out the latter for the first try.
Michael Gill produced a superb tackle and Craig McCann enjoyed a welcome return to play following a long-term absence.