Turning Point: The run of seven unanswered points in the second broke Britain's resolve capped by a three-pointer from Natallia Anufryienka.
Game Hero: Yelena Leuchanka was a huge presence in the paint at both ends, overcoming the hustle of Britain's Julie Page.
Stats Don't Lie: Within 2-point field goal range, Belarus was an efficient 16 of 34. Britain 15 of 49.
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Group B favourites Belarus began their EuroBasket quest with a 55-40 victory over Great Britain in Bydgoszcz.
And, paced by 10 points apiece from Katsiaryna Sntysina and Anastasiya Verameyenka, there were enough signs to suggest they are primed for an extended run at this tournament.
The 2011 world championship semi-finalists found themselves under unexpected pressure from the debutants in the opening period, Britain opening the scoring through Chantelle Handy and then responding to their first test by levelling at 8-8 through former WNBA Draftee Jo Leedham.
However a single free throw from Marina Kress put Belarus in front for good with 2:44 left in the quarter and their top-level experience was evident as they surged away from the 2012 Olympic hosts.
A 13-2 run in the second extended their advantage to 27-13 and although Rose Anderson came off the British bench to spark a brief revival, the Belarussians looked comfortable and composed.
29-20 ahead at half-time, it was no bluff.
Asserting her strength under the basket, Yelena Leuchanka bullied under-sized Britain into submission as the group favourites ruthlessly raced out of sight.
GB coach Tom Maher has won two Olympic medals but he does not do miracles.
There was no way back as Belarus moved as much as 51-30 clear early in the fourth before Britain - led by 8 points from Kim Butler - a late rally.