Sydney McLaughlin-Levrone of the United States has posted a world record 50.37 seconds for Olympic 400 metres hurdles gold at the Paris Games while rival Femke Bol was a distant third. The duel between the two never materialised as McLaughlin-Levrone ran away from Bol and everyone else on the home straight and took .28 of a second off her own mark of 50.65 from earlier in the year for back to back Olympic gold. World champion Bol, who had run 50.95 recently, tired dramatically and was in tears after having to settle for bronze in 52.15, nowhere near McLaughlin-Levrone and beaten for silver by …