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TOPSHOT - Norway's Karsten Warholm (L) and Brazil's Alison Dos Santos compete in the 400m hurdles men final at the Diamond League track and field meeting in Oslo on July 1, 2021. - Norway's Karsten Warholm fired out a shot at potential Tokyo Olympic rivals when he shattered the long-standing 400m hurdles world record at Diamond League meet in Oslo and warned he had "more in the tank". (Photo by Fredrik Hagen / NTB / AFP) / Norway OUT (KEYSTONE/NTB/FREDRIK HAGEN)