Valencia are now the only unbeaten side left in the Liga Endesa after Barcelona were beaten on the road in week seven.
The Catalan giants were beaten 87-79 by Laboral Kutxa in Vitoria after a period of overtime.
With the game tied at 73-73 after four periods, Baskonia scored the first eight points of the extra session to put the game beyond Barca’s reach.
Darius Adams hit 24 points for Laboral Kutxa in the win as both teams are at 6-1.
Valencia are now alone at the top as they remain unbeaten now at 7-0 after a comfortable 92-65 win over winless Gipuzkoa.
Guillem Vives led five Valencia players in double figures with 15.
Real Madrid improved to 6-1 in the league as they inflicted a second defeat of the season to Joventut Badalona. Felipe Reyes paced the current champions with 16 points.
Brandon Paul had a game-high 20 points in reply for Badalona.
Bilbao and Rio Monbus make up the top eight after they recorded wins over Sevilla (81-71) and Estudiantes (73-71), respectively.
Despite having a fantastic season in the Euroleague thus far, Unicaja Malaga are not having it their own way domestically as they fell 82-79 away to Andorra.
Dan Clark paced Andorra with 17 points as they move level with Unicaja in the standings to 3-4, just outside the early playoff picture.
Gran Canaria were comfortable 91-79 winners over Zaragoza as they slump to 1-6 and second bottom.
They other results in the Liga Endesa saw Tenerife secure a 94-85 road win over Fuenlabrada and Manresa got a much needed win at home as they bested UCAM Murcia 77.69.
