PRETORIA, May 10 (Reuters) - The leader of Zimbabwe's main opposition group said on Saturday full access for international observers and media was a pre-condition for his participation in a run-off against President Robert Mugabe.

"We want unfettered access of all international observers. The ZEC (Zimbabwe Electoral Commission) has totally discredited itself to a point now they are partisan to the (ruling) ZANU-PF. The reconstitution of ZEC is therefore paramount," Movement for Democratic Change leader Morgan Tsvangirai said.

"Media access should be unfettered, both print and international media," he said at a news conference in South Africa, listing the conditions for his participation in the run-off after disputed March 29 polls. (Reporting by Phumza Macanda; Writing by Caroline Drees; editing by Sami Aboudi)

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