Belgium bounced back from Wednesday's defeat to Spain by edging Greece, 57-53.
Sara Leemans led the Belgians in scoring with 12 points but it was an all-round team-effort, with Marjorie Carpreaux and Virginie Michiels adding 11 points apiece.
Spain thrashed Belgium 84-44 on Wednesday to keep up their unbeaten run at the U20 European Championship for Women.
Maria Pina and Alejandra de la Fuente added 13 points apiece to guide Spain to their fifth consecutive triumph.
Russia and Spain, two teams considered medal favourites, needed big second half runs to defeat Belgium and Belarus respectively on the first day of qualifying round action at the U20 European Championship for Women.
Spain trailed 38-23 at the break but turned on the style in the fourth quarter by outscoring Belgium 29-7 en route to a 68-56 triumph.
An emphatic 86-40 triumph over Hungary was enough to see Belarus go through to the qualifying round at the U20 European Championship for Women.
Forward Arena Rynkevich led the victors in scoring with 20 points while team-mate Tatsiana Likhtarovich added 17.
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