Overview
- At the Diamond League final in Zurich, Alison dos Santos ran 45.80 in the men's 400m hurdles and Masai Russell ran 12.09 in the women's 100m hurdles, with both times recorded as new world records.
- Karsten Warholm finished second to dos Santos in the 400m hurdles with 46.69, publicly congratulated the Brazilian, and said he needed to "go back to the drawing board" after losing the mark.
- The records came on the fast track at Letzigrund during the Diamond League final, a meeting that also saw Mondo Duplantis win the pole vault at 6.25 metres without improving his world record.
- Dos Santos’s world record caps a season in which he repeatedly beat top rivals and produced multiple sub-47 runs, following a training move to Florida under coach Felipe Sequeira.
- The new times alter the competitive pecking order in both events and raise the bar for upcoming championships, with rivals likely to change training plans and chase faster race strategies.