The FINA World Water Polo Championship is an international water polo tournament, currently held every two years as part of the FINA World Aquatics Championships. Currently the reigning champions are Italy in men's and Greece in women's competition.The FINA World Championships or World Aquatics Championships are the World Championships for aquatic sports: diving, swimming, open water swimming, synchronized swimming and water polo. They are run by FINA, and in the pool swimming events are contested in a 50 m, or "long course", pool.The event was first held in 1973 and is now held every two years. From 1978-1998, the World Championships were held every four years, in the even years between Summer Olympic years. From 2001 on, the Championships have been held every two years, in the odd years.