BOREHAMWOOD, England -- OL Lyonnes forward Melchie Dumornay showed Arsenal exactly what happens when you orchestrate your own demise against a team that is hungry to prove that they're still one of the best in Europe.

The 22-year-old scored both goals in Lyonnes' 2-1 win over Arsenal on Tuesday to open the UEFA Women's Champions League. For Arsenal, defensive fragilities that have persisted since the start of the season forced them to lose their first game in the competition since claiming the UWCL title last season.

Arsenal have been their own worst enemies this season. It was not Lyonnes' ruthless squad, their new manager Jonatan Giraldez's tactics or their eight previous Champions League titles that led to Tuesday's loss. The only side to blame for allowing Lyonnes to secure a

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