Over 200 horses and top riders from 21 nations are poised to begin this second tournament in the summer series.
The Belgian won the €500,000 Longines Global Champions Tour Grand Prix in the French resort town aboard Wathnan Zasou vom Claashof.
The first week of the iconic venue's summer tournaments came to a close, with three more weeks of international show jumping action to go.
The Saudi rider placed one-two in the first CSI5* of the summer tournaments; the show concludes with the AKITA Drilling Grand Prix on Sunday.
Conor Swail kicked off 4* competition with his 5th victory in eight days; the $75,000 FEI CSIO4* Nations Cup takes place on Sunday.
Ireland's Conor Swail ruled the CSI4* division at the Canadian Premier, while Canada's Amy Millar had three close runner-up results.
The Frenchman piloted the speedy, brave grey Gatsby du Tillard to victory as big names fell by the wayside in the rich class.
The US rider has regained the number-one spot in the Longines Jumping Rankings after claiming the World Cup Final title in Fort Worth.
The maple leaf was well-represented on the podium, with Chris Pratt taking first place in the $181,200 5* Qualifier, and Erynn Ballard close behind.
The first CSI5* class took place at Campo Marte over Anderson Lima's colourful course; Erynn Ballard is flying the flag for Canada.