Riga doubled their advantage 11 minutes into the second half when Renate Gaugere rose highest to head home from Minami Oi’s corner.
Glentoran continued to push forward and almost reduced the deficit when Gracie Conway was presented with a good opportunity, but Riga held firm before extending their lead with 10 minutes remaining following an unfortunate own goal.
The Glens continued to battle until the final whistle and were rewarded in the 84th minute. Demi Vance delivered an excellent cross from the left and Faye Loughran powered a header into the net to score Glentoran’s first goal of this season’s UEFA Women’s Champions League campaign.
With the Glens committing players forward in stoppage time, Brima added her second goal of the afternoon to complete the scoring.
Glentoran Women 1-4 Riga FC Women
Starting XI: McKinnon; Foy (C), Keenan, Caldwell, Kerr, G. Conway, Vance, McKearney, Crompton, Moore, Loughran.
Subs: Butler, Bailie, Rogan, Scott, Maguire, Butler, McLaughlin, McMaster, D. Conway, Maguire, Jeffery, McCarron, Timoney.