The 17-year-old gelding was in a class of his own, scoring 86.880 to finish well ahead of the field in the FEI Dressage World Cup.
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The Canadian and Lehar were edged by her coach Conor Swail riding Count Me In in the $226,000 event; she now sits 3rd in the NA standings.
Jumping, dressage, para-dressage, eventing, driving and vaulting will take place at the German venue; Al Ula in KSA will host endurance.
The Frenchman, aboard Dubai du Cedre, won the rich Longines Global Champions Tour finale at the GC Prague Playoffs.
Eight teams move on to Friday's semi-final, led by the Shanghai Swans; New York Empire, Rome Gladiators, Mexico Amigos and Cannes Stars are out.
As the Playoffs in Prague gets underway, the top rider, U25 rider and horse are honoured for their achievements during the season.
A lengthy lawsuit surrounding the purchase and sales of two high-profile jumpers has finally been resolved.
Members suggest utilising other experienced personnel as part of the decision-making process, as is already done in dressage.
Despite losing his stirrup at the second jump, Martin had the only clear round during the second phase of the two-day competition.
The Brit stole victory from reigning European champion Steve Guerdat of Switzerland in the eight-horse jump-off in Italy.