Karsten Warholm remains on top after 400m hurdles Round 1
![Karsten Warholm jumps a hurdle](https://ktvz.b-cdn.net/2024/08/oly24_hlf_atm400h_6249_warholm_1strun_240805-1440x810.jpg)
NBC Olympics
Defending Olympic champion and world record holder Karsten Warholm set off at a blistering pace in the first round of the men’s 400m hurdles in Paris, topping the leaderboard and moving on into the semifinals.