MONROVIA, Oct 18 (Reuters) - Liberia's presidential election was still on track for a run-off on Wednesday after nearly complete provisional results showed President George Weah and opposition leader Joseph Boakai neck-and-neck, below the threshold needed to avoid a second round.

       Following the Oct. 10 general election, Weah holds a slim lead with 43.84% of the vote, while Boakai has 43.44%, according to tallied results from 99.93% of polling places, the West African nation's election commission said.

       To avoid a run-off, the winner must secure more than 50% of votes cast.

       The election commission said on Tuesday that ballots would be re-cast in two polling places in Liberia's northern Nimba County on Oct. 20 due to irregularities.

       Reporting by Alphonso Toweh; Writing by Anait Miridzhanian; Editing by Chris Reese

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