PARIS -- Olympiakos will play Barcelona in the Euroleague final after edging Partizan Belgrade 83-80 in overtime on Friday.
Barcelona beat CSKA Moscow 64-54 in the first semifinal.
Olympiakos went up 77-72 in overtime on a dunk by Ioannis Bourousis and Linas Kleiza's jump shot.
After Jan Vesely made a 3-point play to get Partizan within 77-75, Bourousis grabbed three offensive rebounds and made two free throws to extend Olympiakos' lead to 79-75.
Milos Teodosic's free throws made it 83-80 for Olympiakos, and Aleksandar Rasic missed a 3-pointer that would have forced another overtime.
Kleiza led Olympiakos with 19 points and 11 rebounds, and former Atlanta Hawk Josh Childress added 17 points and five rebounds.
Childress forced the extra period by redirecting Teodosic's off-target 3-pointer. Partizan's Bo McCalebb then missed a 3 at the buzzer.
"In basketball, it's a fine borderline between good luck and bad, and tonight we were on the wrong side of the line," Partizan coach Dusko Vujosevic said. "If Teodosic's shot had touched the rim, there wouldn't have been time for Olympiakos to get the rebound."
"I think I owe Josh my life for saving me," the Olympiakos guard said. "I tried to win the game, but I saw the shot was going to the left, and I didn't know what to think, but all of a sudden Josh came out of nowhere and dunked it."
CSKA had defeated Barcelona in their last two Final Four meetings, in 2006 and 2009, and was seeking to reach its fifth straight final.
Fran Vazquez led Barcelona with 11 points and six rebounds, while young superstar Ricky Rubio finished with 10 points and eight assists.
Ramunas Siskauskas scored 19 points to lead CSKA, while former Duke star Trajan Langdon added 12 points and former University of Kansas star Sasha Kaun had nine points and 10 rebounds.
CSKA ran into trouble at the start of the third period when forward Viktor Khryapa, who led the league in steals and defensive rebounds this season, committed his fourth foul.
"When Viktor Khryapa got in foul trouble it gave us a big headache, because he's a very important player for our team with his defense, rebound and blocks," Siskauskas said. "It was very tiring, because they have a very long bench and our rotation is much shorter."
CSKA got within three points with five minutes left, but a 3-pointer from Erazem Lorbek gave Barcelona a 59-51 lead with 1:14 left. Rubio hit a 3-pointer and Vazquez made a dunk to end CSKA's hopes.
"The key to the game was that our offense was better in the second half," said Barcelona forward Pete Mickeal, who played for Cincinnati in college. "Our defense in the first half was great."