Marek and Fayvel smash their freestyle personal best; Grand Prix Special marked by early tension for Silfvén and Holzer.
The three countrymen topped the podium in the rich Saturday night event; top Canadian was Kyle Timm with Casino Calvin, 7th.
The US rider won back-to-back Challenge Cups; two Canadians place top-10 in competitive class of 52 entries and a 12-horse jumpoff.
Two Grand Prix classes were featured on Thursday, with a number of Canadians well-placed on long-time partners and newer mounts.
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.
Felicitas Hendricks and Drombusch OLD win Grand Prix Freestyle; Susan Pape and Harmony’s V-Plus victorious in Grand Prix Special.
The pair took the $215,000 NetJets CSI4* Grand Prix over a starting field of 46 and an exciting eight-horse jump-off.
Germany’s Richard Vogel led the lap of honour in Dodd Technologies CSI4* while the Canadian makes the podium with Costa Quick PS.
Two Canadians place top-10 in the large field of 59 entries: Tiffany Foster with Battlecry (5th) and Amy Millar riding Truman (7th).