Lenae Williams's (in picture) match winning performance kept Mondville's LFB post season ambitions intact.
She scored 32 of her team's 73 points total, with 17 of her final points coming in the final quarter.
Mondeville had the worst possible start to the game and trailed (2-14) with five minutes played. This had meant that Union Hainaut had overcome the 10-point deficit from game one.
When Williams scored her first trey this ended the dominance of their guests.
While Anne-Sophie Pagnier found her shooting touch and Aurélie Bonnan chased down everything Mondeville went on a surge with a 15-2 run to edge the first quarter (17-16).
The two minute-break came as a blessing in disguise for UHB because it broke the rhythm of their hosts.
USO started to miss shots whereas UHB were able to edge back in front with 5 points coming from Laëtitia Kamba (27-22) midway through the second quarter.
Mondeville's festival of missed opportunities continued until Touty Gandega appeared on the scene. She scored 4 quick points which enabled her team to reduce the deficit (33-36) going into the locker room.
When the teams returned Williams and K. B. Sharp went on a three-point shooting festival to bring the teams level (41-41) with 22 minutes played.
Both sides played cat and mouse for the rest of the third quarter with UHB holding onto the lead (53-52).
The final quarter turned into a Williams show as she scored 17 of her team's 20 points.
UHB, needing to win by more than 10 points to qualify for the LFB challenge round semi-final, had no answer for Williams and ended up losing the match (68-73).
Mondville won the series (143-128) and will meet the winner of the series between Basket Landes and Aix-en-Provence in the other semi-final.
(The player stats are not available yet.) USO Mondeville: Touty Gandega, Anne-Sophie Pagnier, Esther Niamké-Moisan, Aija Brumermane, K. B. Sharp, Lenae Williams, Yacine Séné, Pauline Thizy, Aurélie Bonnan, Valeriya Berezhynska