Jean-Luc Mélenchon (right) speaks with fellow candidate François Fillon | Lionel Bonaventure/AFP via Getty Images Mélenchon won French presidential debate: poll Those polled believed far-left candidate was ‘most convincing,’ but rival Macron had the ‘best plans’ for France.

Far-left candidate Jean-Luc Melénchon was the "most convincing" candidate in Tuesday's all-in French presidential debate, according to an Elabe poll for BFMTV.

About 25 percent of the 1,024 people surveyed thought Mélenchon, leader of the Untamed France movement, was the most convincing of the 11 candidates to take part, four points ahead of centrist candidate Emmanuel Macron on 21 percent. Conservative François Fillon finished third, with 15 percent. National Front chief Marine Le Pen, who was the target of a number of attacks from the other candidates, was the first choice of 11 percent of those surveyed.

When asked which candidate had "the best plans" for France, 23 percent chose Macron, Mélenchon won over 22 percent, Fillon secured 18 percent and Le Pen 15.

The first round of the French presidential election is scheduled April 23. Macron and Le Pen are the favorites to go through to the run-off vote on May 7.