A calamitous display from Vlad Chiriches eventually undid all of goalkeeper Hugo Lloris' good work as a last-gasp penalty earned Besiktas a hard-fought 1-1 draw at Tottenham in the Europa League.
Spurs came into the match buoyed by Saturday's draw at bitter rivals Arsenal - a team Slaven Bilic's side pushed close in this season's Champions League play-offs.
Defeat to the Gunners saw the Turkish outfit drop into the Europa League, where they looked set to suffer more north London frustration until Demba Ba's last-gasp penalty cancelled out Harry Kane's 20-yard strike to secure a 1-1 draw.
Chiriches was guilty of giving away the spot-kick with a foolish handball when trying to make amends for an initial air kick, allowing the former Chelsea striker to finally beat Lloris.
The only survivor from the north London derby team, the France keeper was involved from the outset and produced a wonderful fingertip save to push an early Ba effort on to the woodwork.
Sylvain Marveaux scored twice in three minutes to hand Guingamp victory in their Europa League Group K match against visiting PAOK Salonika.
Marveaux had not scored in nine appearances this season but was the difference between the sides as he followed his 47th-minute opener with a precision free-kick to secure a 2-0 success.