Adrian Henning, Petri Virtanen, Ivan Harris and Pasi Olavi Riihela all poured in 17 points as Lappeenranta posted an 87-71 victory over Keravnos Nicosia.
Patrick Lee and Giorgos Anastasiadis both grabbed 15 points and five rebounds for the visitors.
The hosts started sluggishly and it wasn't until right at the end of the second quarter that they managed to really get in the game.
But once Virtanen's three-pointer shot them into a 39-36 lead they never looked back.
Keravnos had started the brighter, sinking five points to storm into an early 5-0 lead but before they could pull ahead more Lappeenranta sunk seven points with no reply to claw their way to a 7-5 advantage.
And although the start of the second quarter saw the Cypriot side with a nine-point advantage, leading 28-19, the hosts never looked in too much trouble.
Lappeenranta went into a nine-point lead midway through the third quarter but Keravnos managed to pull it back to open the final quarter with only a 59-55 deficit.
But the home team were in scintillating form and Virtanen poured in eight points as they stormed to victory.
Keravnos now need to get something from the return match on November 27.