Their outstanding day's racing means they will go into tomorrow's medal race 13 points clear of their nearest challengers at the French port city venue that will host the sailing at the Paris 2024 Olympics.

It was a very good day too for France's Olympic bronze medallist Pierre Le Coq, who put himself into a highly advantageous position for his medal race tomorrow in the RS:X windsurfing class.

After rain and cloud had affected racing on day three, it was all systems go on day four.

The Italian pairing led from the start in two of their races and only had to overcome a couple of boats in the remaining races as they gave a masterclass in sailing.

"This is our best point of the competition so far, we won all four races and we've never done that at a World Cup Series before," said Banti.

"We are 13 points in the lead and we are feeling confident for tomorrow."

Britain's John Gimson and Anna Burnet are the Italians' nearest challengers, with second Italian pairing Vittorio Bissaro and Maelle Frascari two points behind them.

Le Coq took two race wins and a second place to open up an 11-point lead heading into his medal race, moving clear of his national rivals Thomas Goyard and Louis Giard.

"I feel great," said Le Coq.

"I want to win gold.

"I like this venue with the technical conditions."

Before the medal race, Le Coq is guaranteed one as he is 24 points clear of fourth-placed Pawel Tarnowski of Poland.

Goyard currently occupies second place on 28 points with Giard on 33 and Tarnowski on 41.

Lilian de Geus of The Netherlands could not quite find her form to match the winners from three women's RS:X races but she was able to maintain her overall lead.

De Geus leads Israel's Katy Spychakov, who posted two second places and a race win, by just two points.

"I am feeling pretty confident but we're so close on points that anything can happen," De Geus added.

"I really want to win this and I'll be sure to not make the same mistakes tomorrow."

Britain's Emma Wilson occupies the final podium spot, six points off De Geus.

The men's and women's 470, laser, laser radial and finn fleets - whose medal races will be held on Sunday (June 10) - continued their opening series, sailing an additional race to catch up on races lost the day prior.

Australia's Mat Belcher and Will Ryan moved top in the men's 470 after two race wins and a 10th, which they discard.

Germany's Malte Winkel and Matti Cipra are nine points off the Australians in second place.

In the women's 470, Britain's Hannah Mills and Eilidh McIntyre, the defending World Cup champions, extended their lead to four points after beating Spain's Silvia Mas and Patricia Cantero in two of three races.

Ai Kondo and Miho Yoshioka of Japan remain in contention in third.

Two-time world champion Nick Thompson of Britain holds the lead in the 25-boat laser fleet with 22 points, followed by Hermann Tomasgaard of Norway on 26 and Philipp Buhl of Germany on 28.

Emma Plasschaert of Belgium and Maria Erdi of Hungary continued their battle at the front of the laser radial, with the Belgian turning a one point lead overnight into a 10 point advantage.

After three more tough races in the finn class, Jorge Zarif of Brazil and Andy Maloney of New Zealand are tied on 21 points.

Turkey's Alican Kaynar trails the pair by three points in third after an outstanding day that saw him take two wins and a second.

More than 220 sailors from 34 nations are involved in the competition.