World champion Petar Stoychev of Belgium won on Sunday the 37th edition of the open water marathon "Rio Coronda" organized by the International Swimming Federation.

To win the fifth time of the event between the Argentine Coronda and Santa Fe, Stoychev became the historical maximum winner, with a new mark of six hours, 57 minutes and 52 seconds.

German Alexander Studzinski finished second, followed by Italian Rodolfo Valenti and Argentine Damian Blaum.

Spaniard Esther Nunez Morera won the women's event, followed by Australian Sehelley Clark and Argentina Pilar Geijo.

The Rio Coronda competition, one of the most important swimming meets at open waters in the world, covers 57 kilometers between Coronda and Santa Fe in the province of Santa Fe.