Besiktas Sompo Japan brought Proximus Spirou's Basketball Champions League winning run to a halt with a tense 68-66 victory on Wednesday.
The Belgium side headed to Istanbul on the back of three consecutive Champions League victories, but it was the Group E leaders who prevailed on Gameday 8.
Proximus Spirou led 40-35 at half-time, but Besiktas took charge in the third quarter and withstood a late rally from the visitors to improve their record to 7-1.
Vladimir Stimac grabbed a tournament-record 18 rebounds as well as 11 points after also starring against the same opponents on Gameday 1, while D.J. Strawberry came up with a crucial late block to ensure there was Turkish delight rather than a sour taste in the mouth for Besiktas.
AEK Athens moved into a tie for second place with MHP RIESEN Ludwigsburg courtesy of an 89-76 success at bottom side Szolnoki Olaj.
Mike Dixon claimed a 29-point haul, including eight triples, with Roko Leni Ukic turning on the style during a first half in which he scored all but four of his 20 points. Stelmet Zielona Gora battled back late on to down Dinamo Sassari 81-78.
Iberostar Tenerife lead the way in Group D after brushing aside Cibona 106-84, scoring 58 points in the second half, while Sidigas Avellino and SIG Strasbourg also came out on top.
Banvit remain on course for the play-offs after seeing off Ironi Nahariya 85-77 and Aris got the better of Helios Suns in the other Group A encounter. There was more woe for Khimik in Group B as they slumped to a 93-80 loss at the hands of Avtodor Saratov.