first team sport introduced at the 1900 games, along with cricket, rugby, football, polo (with horses), rowing and tug of war. Women's water polo became an Olympic sport at the 2000 Sydney Olympic Games after political protests from the Australian women's team. One of the most historically known matches often referred to as the Blood in the Water match, was a 1956 Summer Olympics semi-final match between Hungary and the Soviet Union, played in Melbourne. As the athletes left for the games, the Hungarian revolution began, and the Soviet army crushed the uprising. The Hungarians defeated the Soviets 4–0 before the game was called off in the final minute to prevent angry Hungarians in the crowd reacting to Valentin Prokopov punching Ervin Zádor. Other tournaments Every 2 to 4 years since 1973, a men's Water Polo World Championship is organized within the FINA World Aquatics Championships. Women's water polo was added in 1986. A second tournament series, the FINA Water Polo World Cup, has been held every other year since 1979. In 2002, FINA organised the sport's first international league, the FINA Water Polo World League. There is also a European Water Polo Championship that is held every other year. Professional water polo is played in many Southern and Eastern European countries like Croatia, Greece, Hungary, Italy, Montenegro, Russia, Serbia, Spain, etc. with the LEN Euroleague tournament played amongst the best teams. There is also a World Club Water Polo Challenge. See also Swimming (sport) Synchronised swimming Water aerobics Water volleyball Citations General sources External links Water polo | fina.org – Official FINA website Ball games Sports originating in England Sports originating in Scotland Sports originating in the United Kingdom Summer Olympic sports Team sports Polo