Several other prominent athletes struggled, though, in the first major post-Olympic meeting in Europe — held nine time zones away from Oregon.
Olympic pole vault champion Armand Duplantis placed fourth after failing to clear 5.82 meters, 20 centimeters below his gold-medal height. Christopher Nilsen, the American silver medalist, won at 5.82.
In the women’s 400 hurdles, Olympic silver medalist Dalilah Muhammad placed fourth as bronze medalist Femke Bol of the Netherlands won in 53.05.
Karsten Warholm, the men’s Olympic champion in 400 hurdles, switched to the 400 flat and was fourth behind American Wilbert London, who won in 45.17.
Warholm’s world-record time in Tokyo of 45.94 was less than a half-second slower than his 45.51 without hurdles Thursday.
Jakob Ingebrigtsen was another Norwegian gold medalist trying a different event. The 1,500 champion won a 3,000-meter race in 7:33.06.
Olympic champions winning Thursday included Ryan Crouser in men’s shot put, with a Lausanne meeting record of 22.81 meters, and Mariya Lasitskene clearing 1.98 meters in the women’s high jump.