Sunday's feature class at WEF 8 saw another big win for the German rider; Mario Deslauriers' former mount Amsterdam is 3rd with new rider.
The US rider took the $50,000 CaptiveOne Advisors 1.50m National Grand Prix; top Canadian was Tiffany Foster and Windsor Grey, 4th.
Amy Millar delivers a double clear with Truman for the Canadian Team as the United States claims victory, followed by Ireland and Brazil.
Many international riders in the field of 30 used the night class as a prep for the upcoming $150,000 Nations Cup on Friday.
Top Canadian is Jacqueline Steffens, who places 4th with Cat Ninja in a field of 73 entries at the Winter Equestrian Festival.
The German keeps racking up the wins, this time aboard Scuderia 1918 Tobago Z; top Canadian was Mario Deslauriers, 11th with Bardolina 2.
Fresh off their victory in the WEF Challenge Cup on Friday, Allen and the Irish Sport Horse gelding put forth a blistering effort.
Walker and Coralissa jumped to the top of the leaderboard against 62 other talented young riders on the Derby Field at WEF.
Top Canadian in the class was Erynn Ballard riding Catoki's Son Z, who placed 4th in a large starting field of 66 on the grass Derby Field.
Less than a second separated the winner from runner-up Beezie Madden (USA) and her veteran partner Breitling LS.