| Challenger Orleans | 09/27 11:40 | 25 | [124] Otto Virtanen v Lucas Poullain [288] | 6-3,6-4 | |
| Challenger Orleans | 09/25 08:30 | 19 | [410] Antoine Hoang v Lucas Poullain [290] | 3-6,3-6 | |
| Challenger Orleans | 09/24 08:00 | 14 | Tom Paris v Lucas Poullain | 6-3,3-6,4-6 | |
| Challenger Rennes | 09/14 11:30 | 26 | [105] Radu Albot v Lucas Poullain [296] | 6-3,7-6 | |
| Challenger Rennes | 09/13 13:05 | 25 | [318] Gabriel Debru v Lucas Poullain [296] | 3-6,3-6 | |
| Challenger Cassis | 09/08 10:15 | 27 | [182] Mattia Bellucci v Lucas Poullain [318] | 1-6,6-3,6-0 | |
| Challenger Cassis | 09/07 09:35 | 26 | [359] Charles Broom v Lucas Poullain [318] | 6-7,4-6 | |
| Challenger Cassis | 09/05 13:20 | 25 | [318] Lucas Poullain v Benjamin Bonzi [108] | 6-3,6-1 | |
| Challenger Porto | 08/01 13:05 | 25 | [259] Goncalo Oliveira v Lucas Poullain [318] | 6-4,6-0 | |
| Challenger Porto | 07/31 10:00 | 19 | [318] Lucas Poullain v Adria Soriano Barrera [451] | 7-5,7-6 | |
| Challenger Porto | 07/30 12:40 | 14 | Lucas Poullain v Tiago Silva | 6-0,6-1 | |
| ITF M25 Porto | 07/26 12:45 | 25 | [231] Jaime Faria v Lucas Poullain [316] | 6-2,6-3 | |
| Challenger Pozoblanco | 07/16 08:00 | 14 | Lucas Poullain v Evgeny Karlovskiy | 3-6,2-6 | |
| ITF M25 Ajaccio | 07/09 17:00 | 29 | [367] Lucas Poullain v Jules Marie [329] | 4-6,4-6 | |
| ITF M25 Ajaccio | 07/08 17:35 | 28 | [367] Lucas Poullain v Antoine Bellier [296] | 7-5,7-5 | |
| ITF M25 Ajaccio | 07/07 21:30 | 27 | [272] Dan Added v Lucas Poullain [367] | 6-7,4-6 | |
| ITF M25 Ajaccio | 07/06 15:00 | 26 | [382] Duarte Vale v Lucas Poullain [367] | 3-6,4-6 | |
| ITF M25 Ajaccio | 07/05 07:00 | 25 | Guillaume Dalmasso v Lucas Poullain | 4-6,5-7 | |
| ITF M25 Bakio | 07/01 16:15 | 29 | [490] Henrique Rocha v Lucas Poullain [362] | 6-2,6-2 | |
| ITF M25 Bakio | 06/30 13:00 | 28 | [362] Lucas Poullain v Stefanos Sakellaridis [487] | 1-6,6-2,6-1 | |
| ITF M25 Bakio | 06/29 10:00 | 27 | Lucas Poullain v Pedro Vives Marcos | Retired | |
| ITF M25 Bakio | 06/28 08:00 | 26 | [362] Lucas Poullain v John Echeverria [458] | 7-5,7-6 | |
| ITF M25 Bakio | 06/26 16:25 | 25 | Lucas Poullain v Carlos Divar | 6-2,6-2 | |
| Challenger Blois | 06/18 11:50 | 14 | [204] Conner Huertas Del Pino v Lucas Poullain [353] | 6-3,4-6,6-1 | |
| ITF M25 Carnac | 06/03 13:00 | 29 | [414] Lucas Poullain v Antoine Hoang [346] | 4-6,6-2,6-2 | |
| ITF M25 Carnac | 06/02 13:50 | 28 | [414] Lucas Poullain v Mathias Bourgue [361] | 7-5,6-2 | |
| ITF M25 Carnac | 06/01 14:15 | 27 | [283] Titouan Droguet v Lucas Poullain [414] | 5-7,4-6 | |
| ITF M25 Carnac | 05/31 12:00 | 26 | Leo Raquillet v Lucas Poullain | 2-6,3-6 | |
| ITF M25 Carnac | 05/30 07:55 | 25 | [489] Mikalai Haliak v Lucas Poullain [414] | 6-2,2-6,3-6 | |
| ITF M15 Krško | 05/20 13:30 | 28 | Mirza Basic v Lucas Poullain | 6-4,6-7,7-5 |