The Mexican rider rode his Olympic mount H5 Porthos Maestro WH Z to take the $215,000 class to edge American and Irish competitors.
The Egyptian rider piloted Evergate Stables' mare who is "such a trier" as the WEF winter tournaments head into the home stretch.
Emilie Conter (BEL) wins the Week 9 CSI5* feature, edging Harry Charles (GBR) and Sherlock and Henrik von Eckermann (SWE) with King Edward.
The US rider piloted the good mare and "alpha horse" Greya to another massive payday under the ‘Saturday Night Lights’ at WEF.
Canada's Mario Deslauriers places 6th with S&L Quatro van de Meerputhoeve in this 7th weekly installment at Winter Equestrian Festival.
Fellow Canadian Brittany Fraser-Beaulieu rounded out the top three on Jill Irving’s Leeghwater in this class for up-and-coming equine talent.
Canadian Nicole Walker and Atout des Trambles were edged by Jessica Springsteen by just one-tenth of a second in the large class of 68.
The victory came aboard the mare Greya, deflecting a strong challenge from Christian Kukuk and his Olympic gold medal partner Checker 47.
This week the Belgian pulled out Katanga V/H Dingeshof, a speedy 15-year-old mare, for the first time this season.
The German rider won the lion's share of the $215,000 purse in the MARS Equestrian CSI4* Grand Prix on the grass field.