Italian world champions Ruggero Tita and Caterina Banti won the first three races of the Nacra 17 European Championships in Weymouth.
The pair have a net total of three points, with compatriots Vittorio Bissaro and Maelle Frascari Diotallevi second with six points.
Spain's Tara Pacheco and Florian Trittel are chasing the Italians, sitting third on eight.
The 49er and 49erFX European Championships are also taking place at the same venue, with four races completed in those events.
New Zealand's Logan Dunning Beck and Oscar Gunn lead after triumphing in three.
A fourth-place finish gave them a net total of seven.
Their team-mates Peter Burling and Blair Tuke are on the same number, but are second after failing to win as many races.
Spain's Diego Botin le Chever and Iago Lopez Marra are third with nine points.
In the 49erFX, Sweden's Vilma Bobeck and Malin Tengström top the standings with a total of five, while Brazil's Martine Grael and Kahena Kunze are second with six.
Annemiek Bekkering and Annette Duetz accumulated seven points and are in third.
Weather conditions prevented the Finn European Championships from beginning in Athens, while the penultimate day of racing at the 470 European Championships in Italy was cancelled for the same reason.