Ahead of their Champions League showdown with Inter, Schalke took on nine-man St Pauli in a match that had to be abandoned before full time.
The conclusion of the match spoiled a 2-0 lead for the visitors, who played convincing football ahead of Tuesday's tussle with the Italian champions in coach Ralf Rangnick's first match in charge since returning to the club.
The contest came at a cost for die Knappen with Mario Gavranovic, Peer Kluge and Christoph Metzelder having sustained injuries in the midst of a rather ugly game. The match may turn out to be even more costly for St Pauli, who face severe sanctions by the Deutscher Fussball Liga (DFL).
It took just two minutes for the visitors to carve out their first scoring opportunity, but Raul's free kick only managed to rattle the crossbar. The veteran Spaniard would not be denied, however, and put die Knappen ahead in the 26th minute with a brilliant glancing header following a corner. The points were up for grabs until the 66th minute, when 17-year-old wonderkid Julian Draxler grabbed his first ever Bundesliga goal as he redirected Jefferson Farfan's cross into the net from close range.
The match took an unfortunate turn shortly after Draxler's goal as Jan Philipp Kalla (68') was sent off for a second bookable offense, and Fin Bartels (78') was given a straight red card for a petulant kick of Farfan.
Raul's opener was a long time coming for Schalke: Alexander Baumjohann had an effort curl just wide in the eighth minute, and moments before the 1-0, substitute Edu had his shot just barely tipped around the post by goalkeeper Benedikt Pliquett. Late in the half, Farfan brilliantly drew out the goalkeeper before squaring to Edu, but Markus Thorandt made a brilliant tackle to deny the Brazilian.
St Pauli looked competent moving forward early on. Bartels in particular came close as his long-range drive whizzed just over the bar, though it was one of the few chances the hosts had on goal.
After the break, St Pauli came roaring back and looked to have equalised as Max Kruse's free kick bounced into the net. However, the goal was controversially called back for offside. Moments later, Draxler made it 2-0.
St Pauli were visibly frustrated by the events of the match, and after Charles Takyi's volley was kept out by a brilliant Manuel Neuer save, Bartels vented his frustration with a disgraceful challenge on Farfan.
The fans at the Millerntor-Stadion took their cue from Bartels, and the beer mug incident was the last straw before the match was declared finished prematurely by referee Deniz Aytekin.