Johannah Leedham's last-gasp shot gave Great Britain a thrilling 61-59 road win over Germany to get them off the mark in the EuroBasket qualification campaign.
Leedham sank a jumper in the final seconds to secure victory just when it looked as though the game was heading for overtime after Britain blew a late lead.
Having surrendered a seven-point advantage midway through the quarter, the Brits were up by two after Mason's jump-shot.
But Dorothea Richter's three-pointer got Germany within one and then, with 2:22 on the clock, Lisa Koop's jumper put Germany in front.
Britain turned the ball over again but Breitreiner could not capitalise as she came up empty on a long-range shot.
Leedham missed a lay-up and Breitreiner was off the mark again to keep it a one-point game going into the final 40 seconds.
Megan Moody hit a three-pointer to put Britain two ahead, but Koop responded with a jumper in the final moments left to tie the scores, 59-59, setting the stage for Leedham's dramatic clincher.
Leedham led Great Britain with 16 points, while Stefanie Collins had 11 and Georgia Jones 10.
Germany wasted 24 points from Breitreiner.