However, Kenya's president, who has been campaigning to defend his win declared in the August polls, Uhuru Kenyatta says Raila Odinga has exercised his democratic right to withdraw from repeat poll, saying the election will proceed as planned.
The court then ordered the election be rerun on October 26.
The Supreme Court issues days later a detailed judgement lambasting the IEBC for failing to properly conduct the election.
If Raila had already written to the IEBC to announce his withdrawal from the race, the law requires that the electoral body declares Uhuru, the only remaining candidate, as duly elected President.
The ruling, the first time in Africa, was hailed by Odinga supporters as "historic".
Nevertheless, they emphasized that Kenya's vibrant constitutional dispensation, coupled with strong independent institutions and the resilience of its citizens, would act as a bulwark against civil disruption in the wake of Odinga's withdrawal from presidential race.
Reports say the situation in Kenya is a worry for the USA government which is "deeply concerned" about the prevailing political environment in Kenya as police and protesters continue to clash ahead of its presidential election on October 26.
In early September, the supreme court had annulled the results of the presidential election which were held on August 8 and ordered for a fresh vote in 60 days.
Odinga has vowed to boycott the polls if his demands, such as the overhauling of the election commission, are not met.
Following the ruling, IEBC chairman Wafula Chebukati announced that repeat presidential polls would be held on October 26 and only Kenyatta and Odinga could participate in the re-run as provided for in the constitution.
Kenyatta had said he would abide by the court decision but has repeatedly accused the justices of standing in the way of the people's will.
"We have no problem going back to elections".
The opposition says the changes are meant to make the transmission of election results a manual process that would have fewer safeguards against electoral fraud and would make it more hard for the Supreme Court to annul an election.
Odinga addresses the press on Tuesday.
"While the Commission was not able to determine whether the action to use force by security agents was predetermined and targeted, it is clear from our analysis that majority of the victims were from one ethnic community and from informal settlements", the report said.
Kenyatta won the August 8 vote by a margin of 1.4 million votes over Odinga.