2021 Play In Challenger

The 2021 Play In Challenger was a professional tennis tournament played on indoor hard courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Lille, France, between 22 and 28 March 2021.

Seeds

 * 1 Rankings are as of 15 March 2021.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇫🇷 Arthur Cazaux
 * 🇫🇷 Evan Furness
 * 🇫🇷 Lilian Marmousez

The following player received entry into the singles main draw using a protected ranking:
 * 🇩🇪 Dustin Brown

The following player received entry into the singles main draw as an alternate:
 * 🇫🇷 Maxime Hamou

The following players received entry from the qualifying draw:
 * 🇧🇪 Zizou Bergs
 * 🇫🇷 Jurgen Briand
 * 🇫🇷 Baptiste Crepatte
 * 🇫🇷 Matteo Martineau

The following player received entry as a lucky loser:
 * 🇷🇴 Filip Cristian Jianu

Singles

 * 🇧🇪 Zizou Bergs def. 🇫🇷 Grégoire Barrère 4–6, 6–1, 7–6(7–5).

Doubles

 * 🇫🇷 Benjamin Bonzi / 🇫🇷 Antoine Hoang def. 🇫🇷 Dan Added / 🇧🇪 Michael Geerts 6–3, 6–1.