The Irish rider won the rich Saturday feature in a field of 43 on the grass derby field with his solid partner of five years.
Kent Farrington and Landon score in the WEF Challenge Cup 4, while Canadians place third and win a class earlier in the day.
The pair took the $215,000 NetJets CSI4* Grand Prix over a starting field of 46 and an exciting eight-horse jump-off.
Cydello is a new addition to the German rider's string; the pair edged Nicola Philippaerts with Derby de Riverland.
The Irish rider won the Dodd Technologies CSI3* at WEF aboard Jacqueline Steffens-Daly's former ride; Canadian Nicole Walker fifth.
The British rider won the first ‘Saturday Night Lights’ grand prix of 2024 riding Enjeu de Grisien; Tiffany Foster and Northern Light place 6th.
An enormous field of 72 entries tackled the WEF Challenge Cup Round 1, with the Irishman coming out on top.
The Lebanese rider started his season off with a victory aboard Quantum Cruise; top Canadian was Amy Millar with Don't Worry Farmer in 5th.
The relatively new partnership is really solidifying on a horse the American rider chose for his clear-round consistency.
The US rider took the $226,000 Horseware Ireland CSI4* at Wellington International over "definitely the biggest track she’s jumped.”