The event, in which the performance of competitors count for selections for Asiad and Olympic teams, is being held at the Hussain Sagar lake here.
Ayaz Shaikh and Shubham Patel are leading the medal tally in 470 class. The duo marched ahead in all the races sailed so far in the category, an official release said.
EMESA duo of Ashish Patel and Nagen Behera were ahead in all the three races of the day in Enterprise Class.
Only a limited races were conducted in the evening session due to rain. The event concludes on July 8.