In its first EuroLeague playoff game this century, Zalgiris recovered from a slow start to beat Olympiacos 87-78 on the road after overtime.
Railing 23-8 early on, Zalgiris fought their way back into the game and eventually dominated the overtime period having been denied by a three from Vassilis Spanoulis, which forced the extra session.
Brandon Davies led the way with 21 points for the Lithuanian side.
Champions Fenerbahçe secures their tenth straight playoff win by downing Baskonia 82-73 in Istanbul.
Fenerbahce used a strong first half, relying on its suffocating defence to build a 20-point lead, then fended off Baskonia’s attempt to rally in the second half.
Brad Wanamaker finished as Fenerbahce’s top scorer with 16 points.