Judge Belinda Hartley, however, ruled that the papers filed for case could be used for a possible review of the conference.
During his first media briefing in the position, Mabuyane seemed confident that the party would win the court case.
Mabuyane received 931 votes in a result announced by the independent electoral commission (IEC) on Sunday morning.
At least eight people were injured after the adoption of credentials on Saturday night, as supporters of Phumulo Masualle walked out of the gathering.
A fierce election contest between chairperson Phumulo Masualle and secretary Oscar Mabuyane is expected to take place once the gathering gets underway
The first day of the conference in East London ended with about a hundred ANC members storming the venue.
The way may now be cleared for Oscar Mabuyane to take the leadership at the ANC’s Eastern Cape conference
So-called Daily Chronicle claimed Mabuyane had withdrawn from the leadership race and quotes an “exclusive interview”.
An application to nullify the ANC’s election candidate lists in the Eastern Cape’s Alfred Nzo region was dismissed by a high court on Wednesday.