Already securing the title with 6.00 metres, Duplantis improved the previous world record of 6.20 metres, set by him at the World Athletics Indoor Championships in March, by one centimetre.
Annu Rani, who had also reached the final Doha edition in 2019 and eventually finished eighth, qualified for the final with a throw of 59.60 metres.
Rojas highlighted her status as the ruler of the triple jump after the Olympic champion jumped 15.47 metres to win a third straight world title.
The reigning World Champion led Jamaica to a podium sweep, with Shericka Jackson taking silver and Elaine Thompson-Herah taking bronze.
Several athletes from all around the world were forced to miss Oregon 2022, being held in Eugene from July 15 to 24, after being refused visas to the U.S. or due to late issuance. However, Dhanalakshmi's case is slightly different.
The 27-year-old Toor made a few practice puts before the qualification round in Oregon but decided to withdraw after failing to recover from the adductor muscle strain he suffered four days ago at a training session in Chula Vista, USA.
The Championship will now take place between July 15 and July 24, 2022, informed World Athletics on Wednesday.