Three-time champions Olympiacos required overtime to beat Anadolu Efes 91-87 in Euroleague action on Thursday.
With the score level at 76-76 after the fourth quarter, an extra period was needed, and the Greek side outscored their opponents 15-11 to emerge triumphant in the Group B clash.
The result sent Olympiacos two points clear of Laboral Kutxa.
Jayson Granger hit 26 points for Anadolu, including a trio of three-pointers, but ended up on the losing team with the 2014-15 runners-up.
Limoges overcame EA7 Olimpia Milano74-65, despite trailing at the end of the first quarter.
An impressive second period - in which Limoges outscored their opponents by 11 - turned the tide in their favour.
They moved into fourth position, while Milano remain rooted to the foot of the group with one win in five.
In Group D, Darussafaka were trailing by two points at half-time but fought back to pick up a resounding 84-73 win at Maccabi Tel Aviv.
Two-time winners Barcelona rallied to beat Kuban Krasnodar 72-68.
Malcolm Delaney's missed free throws late on proved costly for Kuban, who are now joined by Barca on nine points at the top of Group C.
Crvena Zvedza Telekom outscored Bayern Munich by 14 points in the final quarter to secure a 90-79 win that sent them level with the German side - and Group A leaders Khimki - on seven points.