Wexford Youths 5-1 Cardiff Met
With host club Medyk Konin beating Lithuanian top seeds Gintra 4-0 in the other fixture it meant they won the group.
Ireland international Carol Breen was the star of the show with four goals on the day and she put Will Doyle's side off to a flyer when she turned the ball home in the third minute.
Breen then made it 2-0 in the sixth minute after Cardiff Met keeper Sara Moreira saved Claire O'Riordan's initial effort.
Becky Cassin extended that lead on the half-hour before Breen completed an impressive hat-trick three minutes before the break.
The Welsh side's captain Emily Allen pulled on back on the hour but Breen wrapped up the scoring in the 80th minute to finish off an excellent week for the Continental Tyres Women's National League champions.
"We finished on a high. The first half was a decent performance but in the second half we let it go a little as we knew the other score so it was in Konin's hands," said Will Doyle.
"I was delighted to get two wins, I wouldn't have changed much of what we did against Konin. We were just against a very good side in testing conditions and we fell short in that one.
"Carol was fantastic all week. She had a point to prove and she made it. It was a brilliant individual performance to score four times in UEFA Champions League game.
"I couldn't ask much more from the girls, the heat was a massive issue. We tried to rotate players and we're delighted to go home with the two wins. I was pleased to get as many players as we could onto the pitch and experience this level of the game.
"We have to switch on for the league campaign now and we want to retain that title and have another opportunity to play at this level next year."
CARDIFF MET: Sara Moreira, Scherschel , Billingham, Tucker, Sargent, O'Connor, Murray, Allen, Fever, Mathias (Todd 32), Davy (Ayling 78).
WEXFORD YOUTHS WOMEN'S AFC: Kelly, Gleeson, Fahy, Murphy, Cassin, Kennedy (Hutchinson 46), O'Riordan (Webb 46), Breen, Rossiter, Sinnott, Douglas (Frawley 79).
