Baskonia came back from a 21-point deficit, but Fenerbahce stood tall and defeated the Basques to earn its 12th consecutive win (96-87).
The hosts were in front by seven at halftime (48-41) and extended their lead to 21 points early in the third quarter (69-48).
The visitors turned things around, though, and went on a 13-33 run to cut the deficit to one in the middle of the fourth quarter (82-81).
Yet, the Turks improved their overall performance and made some big shots to seal the deal.
Five players scored in double figures for the winners, with Nicolo Melli having a team-high 19 points.
Shavon Shields posted a game-high 22 points for the losing squad, as Vincent Poirier added 15 points and six rebounds.
Fenerbahce improved to 15-1, whereas Baskonia dropped to 7-9.