Jaycee Carroll made the three-pointer, with three seconds to go, and Real Madrid survived the late thriller against Maccabi Tel-Aviv at home (86-85).
It was a close game from start to finish, as no team led by more than nine points in the contest (43-34 in favour of Real).
Scottie Wilbekin put the Israelis in front by two (83-85), yet it was Carroll that decided the outcome of the match, giving the Spaniards their second victory in the competition (2-0).
Jordan Mickey led the winners with 16 points, while Carroll added 14. On the other hand, Wilbekin had a game-high 22 points for the losing squad, with Maccabi remaining winless in the league (0-2).