Chloe Craig's second-half penalty secured the points as defending champions Celtic edged out Glasgow City 1-0.
Maria McAneny won the spot-kick for Elena Sadiku's side following a challenge by City defender Sam van Diemen midway through the second half.
Craig sent Lee Gibson the wrong way to put Celtic in front.
Celtic goalkeeper Kelsey Daugherty had to pull out some big saves to keep City at bay and help secure the win.