The acclaimed Swiss venue will feature the Rolex IJRC Top 10 Final and the Rolex Grand Prix, the final Grand Slam major of 2023.
The German was astride a relatively new ride, Coolio 42, on an afternoon which saw a surprising elimination for Kevin Staut.
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.
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.
Members suggest utilising other experienced personnel as part of the decision-making process, as is already done in dressage.
The Brit stole victory from reigning European champion Steve Guerdat of Switzerland in the eight-horse jump-off in Italy.
The Israeli rider and Gemma W were 2nd in last year's World Cup class here; top Canadian was Vanessa Mannix riding Carmela Z, who placed 4th.
The Irish rider rode Ariel Grange's Legacy to win the $150,000 Mad Barn Big Ben International Challenge at the Royal Horse Show.
Hot off their Pan Am Games gold medal, the two Americans took the Royal features; plus you can now wager on Saturday's World Cup class!