Opinion survery conducted by CSA polling agency for BFM television, 20 Minutes daily, and RMC radio.
This survey raises questions about who will come third in France's presidential race. A rise in voter intentions for left-wing candidate Jean-Luc Mélenchon (13%) and declining support for far-right leader Marine Le Pen (13.5%), have put the pair in a technical tie with centrist François Bayrou (13%).
CSA's poll showed Nicolas Sarkozy enjoyed a small lead (30%) over his main challenger, Socialist Party candidate François Hollande (28%) in the first round of the French presiential race.
Green candidate Eva Joly continued to struggle, with only 2% support, the study showed.