Yoo Myung-hee’s withdrawal has all but guaranteed the former Nigerian finance minister’s victory for the top job at the multilateral institution.
WTO’s spokesperson Keith Rockwell had described Mrs. Okonjo-Iweala as the best candidate for its keenly contested top job.
Ex-finance minister Okonjo Iweala is vying for the DG role.
The global trade body says the Nigerian is a shoo-in for the first female director-general.
The United States is backing South Korean Yoo Myung-hee to be director-general of the World Trade Organisation.
The former Nigerian finance minister faces a South Korean woman after candidates of the United Kingdom, Kenya and Saudi Arabia were eliminated.