Courtesy of WOWSA, Huntington Beach, California. A day after the opening race of the 2015 FINA/HOSA 10 km Marathon Swimming World Cup series in Argentina this weekend, the opening event on the 6-race FINA Open Water Swimming Grand Prix also kicks off in the Paraná River in Argentina. This Sunday, the inaugural 25 km Villa Urquiza-Paraná race will be held