Having finished the first period with a 21-18 advantage, Tallinna Kalev opened up an even bigger gap in the second quarter. The guests used a quick 9-0 run to pull away to a 39-24 lead.
With the third period coming to a close, Dolphins were still behind by nine points (49-58), but Jermont Horton knocked down a jumper to make it a seven-point game before the final quarter.
The hosts kept clawing at the deficit, before eventually not only tying the score (70-70) with 2:40 left in the game, but then jumping into a 74-70 lead after two big baskets by Edgars Jeromanovs and Jan Tomanec.
Reimo Tamm answered with two buckets of his own to force an extra period. But after an excellent start to the game, Tallinna Kalev ran out of steam in overtime, as Dolphins prevailed.
Jermont Horton and William Walker, who also had 11 rebounds, led all scorers with 17 points each, while Edgars Jeromanovs added 15 points and seven assists.
Tallinna Kalev’s trio of Kaido Saks, Reimo Tamm and Asenso Ampim scored 16 points apiece. Renato Lindmets added a double-double of 13 points and 12 boards.