Defending champions PAOK dominated AEK to win the Greek Cup final 2-0.
They celebrated by donning masks bearing the likeness of banned team owner Ivan Savvidis.
Russian-Greek businessman Savvidis was issued a three-year ban from games for storming the pitch at a PAOK-AEK Super League game two months ago with a holstered pistol.
PAOK were docked three points, contributing greatly to the loss of the Greek league championship to AEK.
The cup final ended with 19 players on the field after PAOK had Mauricio dismissed in the 80th minute, for a hard foul, and Fernando Varela after the second goal, for excessive celebration.
AEK's Ognjen Vranjes was sent off seconds after Mauricio for going after Varela.
The decisions were made by Spanish referee David Borbalan, who was appointed along with two Spanish assistants by the Greek Football Federation after recent disputed decisions sparked violence at matches.
Borbalan's performance was praised by several Greek sports commentators but they also noted no Greek referee would have survived showing nine yellow and three red cards without being bullied by both teams.
There was still fan violence in and around the venue, Athens' Olympic Stadium, despite the deployment of 5,000 police.
About 100 AEK fans forced five PAOK supporters, who were assaulted, out of a car and set fire to it, near a train station close to the stadium.
In clashes between AEK, PAOK and Olympiacos hooligans late Friday and early Saturday, eight police officers were injured, police said.
A fan was stabbed; it was not known which team he was a supporter of.
To avoid clashes inside the arena, just 34,400 tickets were issued, less than half of the nearly 70,000 capacity.
That did not prevent opposing fans from throwing flares at each other and attempting, unsuccessfully, to cut through barriers and attempt to break through cordons of riot police.
Tear gas and stun grenades were used inside and outside the stadium, although not during the game.
Vieirinha scored in the 65th minute from a free kick and Dimitris Pelkas added the second in injury time.
Aleksandar Prijovic had his penalty kick being saved by AEK goalkeeper Vassilis Barkas in the first half.
"The best team won," AEK chairman Dimitris Melissanidis conceded.
Three UEFA observers attended the final after international soccer authorities threatened Greece with suspension from FIFA unless the federation, clubs, and the government's sport ministry fulfill a list of reforms.