Alison dos Santos delivered a landmark performance at the Zurich Diamond League on Thursday, lowering the men's 400-meter hurdles world record to 45.80 seconds and producing one of the sport’s most dramatic results of the season.
Record run and swift context
The 26-year-old from Brazil overtook the stagger and drew clear in the back half of the race to eclipse the previous mark of 45.94 set at the Tokyo Olympics in 2021. Norway’s Karsten Warholm, the Olympic champion and the former record-holder, finished second in a fast time of 46.69.
The Zurich meeting produced further fireworks less than an hour later when U.S. sprint hurdler Masai Russell stopped the clock at 12.09 seconds in the women's 100m hurdles, a new world best that trimmed the prior record held by Nigeria’s Tobi Amusan. Amusan was runner-up in the final.
What changed and what it means
Dos Santos’ performance marked a notable progression for an event that has seen rapid improvement this decade. The Brazilian’s time shaved 0.14 seconds off the Olympic-era record, a considerable margin in a discipline measured to the hundredth of a second. Warholm’s 2021 mark stood as a high-water mark for years; Thursday’s result resets the benchmark for elite 400m hurdlers worldwide.
The twin world records in one meeting highlight Zurich's place on the global athletics calendar as a venue where top-tier athletes frequently produce career-defining runs. For Dos Santos, the record consolidates a season in which he has been unbeaten in the event, and it positions him as the athlete to beat heading into next year’s major championships.
- Men’s 400m hurdles: Alison dos Santos — 45.80 (world record)
- Second place: Karsten Warholm — 46.69
- Women’s 100m hurdles: Masai Russell — 12.09 (world record)
- Runner-up: Tobi Amusan — 12.23 (season’s best)
Performance details and verification
World records in track events are subject to ratification by the sport’s governing bodies, which review timing systems, doping-control results and technical compliance such as wind readings. Both marks set in Zurich were immediately recognised by meet officials and are expected to proceed through the formal ratification processes.
While automatic timing and stadium systems provide near-instantaneous results, records are only confirmed after the required administrative and anti-doping checks are complete. The times recorded in Zurich, however, already stand as the fastest recorded performances pending those formalities.
Broader implications for the sport
The dual records underline the increasing depth and competitiveness across sprint and hurdles disciplines. Coaches and athletes will study the races for technical and tactical clues: Dos Santos’ ability to gain on the stagger midway through the race and maintain form over the final hurdle, and Russell’s clean, efficient rhythm between barriers that yielded her sharp margin of improvement.
For global athletics, moments like these tend to reset standards and inspire a cycle of performance gains as rivals pursue marginal improvements. Upcoming meets and championship selections will now be framed by the new times, altering qualification dynamics and race strategies for elite competitors.
| Event | Athlete | Time | Placement |
|---|---|---|---|
| Men’s 400m hurdles | Alison dos Santos | 45.80 | 1st (WR) |
| Men’s 400m hurdles | Karsten Warholm | 46.69 | 2nd |
| Women’s 100m hurdles | Masai Russell | 12.09 | 1st (WR) |
| Women’s 100m hurdles | Tobi Amusan | 12.23 | 2nd |
As athletics moves toward next season’s marquee events, performances of this magnitude will be dissected by rivals, coaches and fans. For now, Zurich is where two world records fell in quick succession — a reminder that even long-standing marks can be overtaken on the sport’s biggest stages.
