Cenk Tosun scored twice as Besiktas won 2-1 away to Monaco for a third straight win to move closer to qualifying for the Champions League knockout stage on Tuesday.
Monaco, last season's swashbuckling semifinalist, are heading the other way with one point from three matches.
However, with Liepzig beating Porto 3-2 in Group G's other game, Monaco still have a chance. With three games left, Liepzig have four points and Porto three.
Radamel Falcao put Monaco ahead in the 30th minute after running onto Keita Balde's well-timed pass and guiding the ball into the right corner. It was the Colombia striker's 13th goal of the season.
Monaco's lead lasted three minutes, as weak defending allowed veteran right winger Ricardo Quaresma space to ping an accurate cross that Tosun met with a close-range header.
Last week, he scored twice for Turkey against Finland in a World Cup qualifier. Last season, he netted 20 league goals for the Istanbul side.
Tosun showed those poaching instincts, finishing neatly after midfielder Tolgay Arslan's shot came back off the post in the 54th.
Monaco scored more than 150 goals in all competitions last season, winning Ligue 1 in style and falling to Italian champion Juventus in the Champions League semifinals.
But this side have none of the same verve after key players were sold in the offseason.
Winger Ryan Babel had an early goal ruled out for offside for Besiktas, with television replays showing he was level with the defender.
Veteran defender Pepe was lucky to avoid a red card as the last man after hauling down striker Balde, and from the free kick goalkeeper Fabri fisted away Thomas Lemar's effort.
It was a rare Monaco chance, and moments later Monaco goalkeeper Danijel Subasic kept out Atiba Hutchinson's volley.