The Standard Life GB under-20 women played unbeaten Belgium in the first game of the day in Albena on Tuesday and were defeated 79-42.
Shequila Joseph had 12 points and seven rebounds for GB with Leah McDerment adding 11 points and three rebounds and Claire Paxton seven points and six rebounds.
Under-18 McDerment, who showed great energy at both ends of the floor remained positive despite the loss: "Today we played one of the best teams in the tournament and showed that despite the result we are improving each game and will continue to challenge the opposition. We look forward to playing Israel on Friday where we will be aiming for our first win of the tournament."
The first quarter saw the strong Belgian side take the lead 23-13 as they defended full court and capitalised on the GB turnovers at their offensive end.
The second period was even tougher for GB as they did not manage to score until the eighth minute when Joseph made seven of her teams total quarter points including one from behind the arc and two from the line. At the half time stage Belgium led by 23.
Belgium continued to shoot well in the second half and despite some impressive effort from McDerment who added six of her points in the final quarter, the Belgian side were too dominant for GB.
Belgium scored 13 of their 35 three point attempts and forced GB into 20 turnovers for the game.
GB head coach, Matt Johnson spoke after the game: "We have now finished the second part of our league programme and with only three games remaining we are determined to continue the improvements we have seen in each game.
"It has been a tough road to this point and has tested some of the strongest of characters but it is also a road that we need to go down together.
"We are strongly supported by GB Basketball in many areas and we are now looking forward to a short break before commencing the final part of our journey against Israel, Romania and Portugal."
The team have two days off now before they play their final three games of the tournament. Starting with Israel on Friday at 11:45 (BST).
A second half where Great Britain won by twenty points wasn't enough to secure victory in a closed-doors preparation game against the Netherlands at Manchester's National Basketball Centre. The visitors won 71-83, with Kyle Johnson and Gabe Olaseni both scoring 13 points for GB.