He has already earned the assurances of the US and some other important member nations of the UN Security council. Moreover, there hasn't been any other candidate who has announced his or her intentions to run for the post.
Ban's letter to Gabon's UN Ambassador Nelson Messone, this month's council president said, "As I approach the end of my term of office as the secretary-general of the United Nations, I am humbly submitting my name for the consideration of the members of the Security Council for a second term."
In the letter addressed to Messone, he wrote, " (he and the council) found common ground on critical global issues of peace and security -- from Somalia to Sudan, Cote d'Ivoire (Ivory Coast) to Afghanistan, Iraq and the Middle East and far beyond."
And added, "I am proud of all we have done together, even as I am mindful of the formidable challenges ahead."
At a news conference in the United Nations Headquarters, the former South Korean foreign minister cited his bid to make climate change - a top concern for governments around the world as one of his major accomplishments as the Secretary General of the multi-nation organisation.
Off late, he has met the leaders of Britain, China, France, Russia and the United States, the five permanent veto-wielding council members of the UN Security Council to garner support for his bid for a re-election.
France has publicly backed his candidature and said, "The UN, and the entire international community, can rely on him, on his very solid experience and on his authority. Ban Ki-moon has France's full support."
Moon's term ends this Dec 31.