Emily Keogh Apr 26, 2026, 02:25 PM ET Close Based in London, Emily Keogh is ESPN's women's soccer correspondent, specializing in the WSL and UWCL LONDON -- Calamitous defensive errors from OL Lyonnes gifted Arsenal a vital lead heading into the second leg of the UEFA Women's Champions League semifinals, winning 2-1 on Sunday and putting them within touching distance of a second European final. The holders were looking a 1-0 loss had it not been for the utterly disastrous defending from the eight-time winners that orchestrated their downfall. It was flat and rather subdued from Arsenal for the first hour. Their profligacy had prevented them from cancelling out Jule Brand 's opening strike that was born out of Arsenal's inability to control the ball, losing it in a key area for Lyonnes to capitalize on.…