The gauntlet has been thrown down — Ukrainian Presidential candidate Volodymyr Zelensky has challenged Ukraine’s current leader to a debate.

A presidential showdown of epic proportions, if you will.

In a polished new video released Wednesday, comedian Zelensky, who has no political experience, challenged incumbent President Petro Poroshenko to a debate in the Olympic National Sports Complex in Kiev, which seats over 70,000 people, euronews says.

Standing in a suit and tie in the middle of the empty stadium, the newcomer piled pressure on the current leader to accept his challenge, saying: “I give you 24 hours to decide. Think about it.”

A clock is now counting down on the Facebook page of his campaign.

Zelensky, who plays a fictional president on TV, grabbed international headlines this week when he led with just over 30% of votes in Ukraine's presidential election on Sunday.

The election is expected to go into a run-off vote on April 21 with the top two candidates facing off, as no candidate is expected to win a majority.

Whoever wins the vote will inherit a conflict between Ukrainian troops and Russian-backed separatists in the East, after the 2014 Maidan street protests forced out the former pro-Russian President Viktor Yanukovych and Russia annexed the Crimean peninsula.

Ukraine's economy also hangs in the balance and the next leader will decide whether to enforce the reforms required to keep the country in an International Monetary Fund bailout programme.