Panathinaikos came from 15-points down to beat Red Star Belgrade 90-86 in overtime in Group D.
Trailing 56-48 at the end of the third quarter, the Serbians looked in firm control but the Greens hit back to take the lead in the final period before a Blake Schlib three for Red Star sent the game into overtime.
Panathinaikos hung on though in the extra period to record the win as they improve to 2-1 in the group. Red Star are yet to win.
Nikos Pappas had a game-high 24 points fro the winners. Schlib had 19 for Red Star.
Stelmet Zielona Gora recorded its first ever Euroleague win by beating Montepaschi Siena 73-65 in Poland.
The Polish champions trailed for stages in the game but fond themselves comfortably ahead for the majority as they to 1-2 in Group C and leave Siena without a win.
“I’m very excited and happy,” said Stelmet Zielona Gora coach Mihailo Uvalin.
“This is very good night for my team. We have a historic win in the Euroleague. I know that this is one game, but this game was great. Life is full of surprises because we lost to Malaga and tonight my team won in good style. We controlled this game. Siena was a good rival, but we knew them very well.”
Elsewhere, 23 points from Casey Jacobsen, including a game-winner with 1.3 seconds left secured an 88-86 win for Brose baskets over Anadolu Efes.
Jamon Gordon gave Efes the lead with 6 seconds left but Jacobsen ensured that there would be a final twist in what was a thrilling game.
“The game went up and down, for sure it was a game of runs. I thought our energy in that third quarter kind of brought us back to life,” Bamberg coach Chris Fleming said.
Maccabi Electra Tel Aviv were comfortable 73-58 winners away at Lokomotiv Kuban.
Ricky Hickman and Joe Ingles each led the Israeli side with 14 points as both sides are now 2-1 in Group D following this contest.
Real Madrid were easy 93-74 winners over EA7 Milano in the Spanish capital.
Rudy Fernandez led the Liga Endesa side with 16 points as a second quarter blitz made the game safe. Leading 25-20, Madrid extended it to 52-31 at the half and never looked back.