Pole vault Olympic champion and world record holder Armand Duplantis and Norwegian sprinter Karten Warholm will stage an unusual duel and compete against each other in a 100-metres sprint. The duel is to take place on September 4 on the eve of the Diamond League meeting in Zurich. The outcome of the sprint looks completely open as their best times are not far apart. Warholm, the Tokyo 2020 400m hurdles champion, clocked 10.49 seconds in 2017. Duplantis ran the 100m in 10.57s just one year later. Sweden’s Duplantis, who at the Paris Olympics set a pole vault world record of 6.25m, challenged Wa…