Reigning World champion Karsten Warholm clocked 47.33 for the win in Oslo and broke the 27-year-old Harald Schmid's European record of 47.48. Warholm also became the 13th best 400m of all time.
Men's 400m hurdles results
1. Karsten WARHOLM NOR 47.33
2. Thomas BARR IRL 49.11
3. Kyron MCMASTER IVB 49.12
4. David KENDZIERA USA 49.27
5. Takatoshi ABE JPN 49.78
6. Patryk DOBEK POL 49.80
7. TJ HOLMES USA 50.60