The German took the 5* Qualifier at MLSJ Monterrey with Otello de Guldenboom while the Canadian was close riding De Flor 111 Z Santa Rosa.
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The German and the 14-year-old bay gelding won the FEI Dressage World Cup Grand Prix - her sixth victory at this French venue.
Driving’s biggest names will showcase their skills and speed in the new series taking place at European shows between November and February.
The 17-year-old rode Heather MacInnis' Canadian Oldenburg gelding Candescent to win the prestigious event among 40 competitors.
The Brit piloted the small but speedy black stallion to the fastest of just eight double-clears over Guilherme Jorge-designed track.
Incessant rain resulted in a modified cross-country course which saw Caroline Harris and D. Day rocket up the standings.
Sport Licence Holders were invited to submit suggestions for rule changes; they were reviewed and are now posted for comment.
The pair won the Longines FEI Jumping World Cup North American League Washington with one of only two double-clears in the class.
Fifteen riders will descend on Riyadh for the clash of champions in the €1.25 million Longines Global Champions playoff event.
Promising young equine stars competed at Le Lion d’Angers, France; Canada's Rebecca Howard piloted one in the 6YO division.