On the 29er World Championship course, French sailors Kevin Fisher and Glenn Gouron are leading after a stellar second race leading by two thirds of a leg.
They pulled ahead in the points with three discards factored in giving them a 23 point lead ahead of the Argentine team of Pepe Bettini and Fernando Gwozdz, who also sailed a great day.
Danish sailors Oscar Haumann and Taus Holtug have sailed into third overall with Nahuel Martinez and Axel Vugdelija of Argentina just one point behind in fourth.
A change in the weather is anticipated with stronger winds predicted.