The Lithuanian club shares the top spot in the group with other group frontrunners Ventspils and Nevezis, while the visitors from Estonia have only one game in three tries.
Siauliai established an upper hand very early in the game, taking a 17-10 lead six minutes into the opening quarter after a three-pointer by Rokas Giedraitis, who just recently came back from an injury.
Although Parnu came back to shortly take a 22-21 lead in the beginning of the second period, the home side finished the half up 45-36.
Rokas Giedraitis and Vytas Sulskis started the third quarter by scoring eleven points for Siauliai in the first three minutes of the second half, while Parnu players only answered with four points in the stretch.
Having started the final period with 69-51 deficit, the visitors from Parnu fought back to cut the gap to single digits, but it was too big of a difference to cover, as Siauliai ended up taking an easy win.
Julius Jucikas was the top scorer for the winners with 17 points, as Rokas Giedraitis, Vytas Sulskis and Judson Dillard all chipped in with 13 points each.
For Parnu, Janis Vahter collected a game-high 22 points and seven rebounds, with Heiko Rannula chipping in 17 points and five boards.
Highlights of the game: