Sweden's Anton Dahlberg and Fredrik Bergstrom continue to set a hot pace, having won three races and finished second in the other two, and they hold a five-point lead over Australia's Mathew Belcher and Will Ryan and David Bargehr and Lukas Mähr from Austria.
Like the Kiwi pair, this is Dahlberg and Bergstrom's first major regatta since last year's Rio Olympics and they revelled in the conditions of 8-10 knots on the waters of the Thermaikos Gulf.
"I did not expect this, but it is a qualification for the 2018 Aarhus Worlds and we have been at the top of our performance at starts which has made everything a lot simpler," Bergstrom said. "It feels like we have good speed, not better than other people, and we are making some of the biggest decisions quite well in these first five races."
Hannah Mills and Eilidh McIntyre continue to lead the women's fleet but couldn't replicate their perfect scores from yesterday when they had three races wins, posting a fifth and a third, and they have a slim two-point lead over Slovenia's Tina Mrak and Veronika Macarol.
Two more races are scheduled tonight (NZ time).