Stevie Morrison and Chris Grube maintained their advantage in the 49er fleet as light winds tested sailors' patience at the ISAF World Cup in Miami.
The pair are one of three British boats that lead their fleets heading into the decisive medal races.
Windsurfer Bryony Shaw and 470 duo Sophie Weguelin and Eilidh McIntyre maintained their leads after no racing was possible in their events.
In total 14 British boats across eight Olympic classes will now feature in medal races, with Giles Scott well placed in the Finn and world silver medallists Ben Saxton and Hannah Diamond close to the medals in the multihull Nacra 17.
© Sportsbeat 2014