Football is the most popular sport in Serbia, and the Football Association of Serbia with 146,845 registered players, is the largest sporting association in the country. FK Bačka 1901 is the oldest football club in Serbia and the former Yugoslavia. Dragan Džajić was officially recognised as "the best Serbian player of all times" by the Football Association of Serbia, and more recently the likes of Nemanja Vidić, Dejan Stanković, Branislav Ivanović, Aleksandar Kolarov and Nemanja Matić play for the elite European clubs, developing the nation's reputation as one of the world's biggest exporters of footballers. The Serbia national football team lacks relative success although it qualified for three of the last four FIFA World Cups. Serbia national youth football teams have won 2013 U-19 European Championship and 2015 U-20 World Cup. The two main football clubs in Serbia are Red Star (winner of the 1991 European Cup) and Partizan (finalist of the 1966 European Cup), both from Belgrade. The rivalry between the two clubs is known as the "Eternal Derby", and is often cited as one of the most exciting sports rivalries in the world.