The Spaniard swapped Carlo 273 for 12-year-old stallion Abab van het Molenhof for the class, which was one round with a jump-off for the clear rounds.
And the switch immediately paid dividends, the pair going double clear in a quick time of 35.70 to claim victory and the 30,000 euro prize money purse.
Only one rider - the Swiss Pius Schwitzer with Cool Girl - managed to go faster (35.45), but the pair had one fence down and dropped back to sixth place.
French rider Michel Robert with Nenuphar’ Jac had double clear rounds, landing him second place to match his efforts in the Grand Prix a day earlier.
Dutchman Harie Smolders finished just behind in third and young Swiss rider Martin Fuchs fourth, both also with double clear rounds.