Belinda won Sunday's Future Challenge FEI Prix St. Georges riding Quincy, while Camille was 3rd riding MSJ Fürst Zonik.
The pair scored 80.6% during ‘Friday Night Stars’ at AGDF and in April will head to the FEI World Cup Final in Basel, Switzerland.
The Canadian rode Finnländerin to score 75.325%; Kevin Kohmann won the class riding Dünensee with a new personal best of 79.24%.
‘Friday Night Stars’ was a chilly one, but freestyles brought the heat in this qualifier for the new US Equestrian Open of Dressage.
International dressage competition came to a close at AGDF, with a number of Canadians earning top-10 placings in CDI3* and 4* classes.
The "Friday Night Stars" feature event was won by the German aboard Drombusch OLD, while Frederic Wandres took the CDI5* GP Special.
The US rider topped the leaderboard with 71.913%; Canada's Ariana Chia made the podium with Guateque IV in the 33-horse class.
Opening day of AGDF 10 in Wellington, FL, saw a field of 16 tackle the qualifier for the GP Special and Freestyle.
The win came board the mare Finnländerin; third place in the class went to fellow Canuck Denielle Gallagher riding Come Back De Massa.
Denielle Gallagher is 3rd with Come Back De Massa in the CDI3* Grand Prix; Sven Steffens-Smienk takes Derby win.