Advocate Thabani Mpofu, head of a legal team that is mounting the MDC Constitutional Court petition, vowed Wednesday "the poll challenge is going ahead, prepared, clear and convincing".
Despite the contentious election result, the state-owned Herald newspaper has reported that President-elect Emmerson Mnangwagwa will be inaugurated on Sunday, 12 August.
In the petition - filed shortly before the expiry of the seven-day period - Mr Chamisa alleged electoral fraud and malpractices during the elections in which Zanu-PF romped to victory, claiming two-thirds parliamentary majority with President Mnangagwa taking a 6.5 percent lead.
The MDC alliance filed their paperwork with Zimbabwe's Constitutional Court on Friday, alleging the result of the July 30 vote had been rigged in favour of incumbent Mnangagwa, the leader of the ruling ZANU-PF party.
He said those who lost should accept the results and work hard to improve next time. We have a good case and cause!
"In the alternative, we seek that there be another election which complies with the dictates of the law", he said.
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Analysts say the legal challenge has little chance of success given the courts' historic tilt towards the ZANU-PF, which has ruled since independence from British colonial rule in 1980. This was according to Legal and Parliamentary Affairs Minister Ziyambi Ziyambi.
"We have managed to place before the court unpopulated signed V11 forms and V11 forms that shows an attempt to erase the figures that had been entered", he said. Six died after soldiers opened fire on the protesters in a response the opposition alliance called "disproportionate and unjustified".
He faced allegations of inciting the protests last week by proclaiming victory for the opposition.
"Zimbabwe faces a bad threat from a group of people that has no respect for the law", Biti, who was granted bail Thursday, told the court before his case was adjourned until next week.
Tendai Biti was released earlier today following my intervention.
But the MDC say the security forces have launched a brutal crackdown on the opposition following the disputed poll.