PIRAEUS, Greece (Interstat) — In a stunning Champions League upset, Olympiakos SFP B defeated German powerhouse Bayer Leverkusen 2-0 on Tuesday at Stadio Georgios Karaiskáki, defying pregame projections and handing the visitors a sobering start to their European campaign.

The match, played on Jan. 20, 2026, was controlled from the outset by the motivated Greek side, which capitalized on an early goal to set the tone. Defender Costinha opened the scoring in just the second minute, heading home from a corner kick delivered by midfielder Panagiotis Retsos. The early strike immediately shifted pressure onto Leverkusen, which struggled to find its rhythm against a disciplined Olympiakos defense.

The home side doubled its lead in first-half stoppage time. Forward Mehdi Taremi, who was instrumental throughout, received a clever pass from substitute Christian Kofane, who had just entered the match. Taremi calmly finished to give Olympiakos a commanding 2-0 advantage at the break.

Bayer Leverkusen, which entered the match as a significant favorite, failed to mount a serious comeback in the second half. The German club’s attack was repeatedly stifled, managing no goals and rarely testing the Olympiakos goalkeeper. The result contradicted the pregame analytics from Interstat, whose game simulator had projected a 2-1 Leverkusen victory and whose ELO system gave the visitors a 56 percent probability to win.

Taremi was the standout performer, contributing a goal and an assist. Costinha’s early goal proved decisive, while Retsos and Kofane each provided key assists. The match was physical, with three yellow cards issued. Retsos was booked in the fifth minute for Olympiakos, followed by Kofane in the 28th minute. Taremi also received a caution in the 73rd minute.

The victory marks a perfect start in the Champions League for Olympiakos SFP B, which improves its record in the competition to one win and no losses. Across all competitions this season, the club now has one win and no losses. For Bayer Leverkusen, the loss is a damaging opening to its European season, leaving it with no wins and one loss in the Champions League. Its overall season record across all competitions also falls to no wins and one loss.

The defeat raises immediate questions for Leverkusen, which will need to regroup quickly as the group stage continues. For Olympiakos SFP B, the result provides a massive confidence boost and a crucial three points earned against one of the group’s presumed strongest teams, all achieved in front of its home supporters in Piraeus.