Defending champion Stefanos Tsitispas and Daniil Medvedev headline the Marseille indoor event.
After his big ATP Finals crown in November, Tsitsipas enters off a sub-par 3-4 start to 2020.
Tsitsipas and top seed Medvedev will be joined by fellow youngsters Denis Shapovalov, rising teen Jannik Sinner, 2018 champ Karen Khachanov, Felix Auger-Aliassime and Hubert Hurkacz.
Also in the field are veterans Benoit Paire, David Goffin, Marin Cilic, Richard Gasquet and 2-time winner Gilles Simon who is unseeded.
Medvedev could meet Sinner in the second round while Tsitsipas might face Gasquet in his title defense opener.
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