Brazil's Robert Scheidt topped the leaderboard as the men's laser continued at the ISAF Sailing World Championships on Saturday.
A lack of wind caused proceedings to be delayed momentarily at the event in Santander, but the action got under way when an eight-knot breeze picked up.
Competitors in the men's laser were forced to switch to the course the women had used a day earlier, providing them with a stronger current to deal with in the third and fourth qualification races of the contest.
And it proved to be a good day for defending champion Scheidt, who started the day in ninth but now heads the leaderboard after scoring a first and a third in his runs.
"I had good starts, free of the line and then everything gets a lot easier," said the two-time Olympic champion. "Because there was a lot of current throwing you on the line it was it was very difficult.
"Your instinct is to hold back so timing is critical. I think I managed to get that right."
Nick Heiner of the Netherlands came closest to challenging Scheidt, picking up a first- and a fourth-placed finish to go within two points of the leader, while Australia's Tom Burton currently sits third.
The women were also shifted to a different course in the laser radial, but Veronika Fenclova of the Czech Republic managed to defend her slender advantage at the summit.
After a disappointing 12th in the first race of the day, she managed to redeem herself with a third in the second.
Viktorija Andrulyte of Lithuania delivered the best scores of the day to move into second, while Marit Bouwmeester is third.
France flourished in the men's RS:X as Pierre le Coq claimed victory in both his qualification runs, and compatriot Louis Giard is in close pursuit in the 12-race series after registering a first and a third.
There was further French delight in the women's event, with Charline Picon topping the standings after two wins from her three races.
European champion Picon holds a three-point advantage over Mexico's Demita Vega, while Bryony Shaw of Great Britain - winner of the third race of the day - completes the top three.