| ATP Metz | 09/15 12:10 | 64 | [274] Julian Lenz v Constant Lestienne [195] | 4-6,6-3,7-5 | |
| Challenger Szczecin | 09/13 16:50 | 27 | [346] Jozef Kovalik v Constant Lestienne [195] | 6-4,6-4 | |
| Challenger Szczecin | 09/12 15:15 | 26 | [195] Constant Lestienne v Riccardo Bonadio [344] | Retired | |
| Challenger Szczecin | 09/11 09:45 | 25 | Constant Lestienne v Daniel Masur | 6-2,6-3 | |
| US Open | 08/23 20:25 | 46 | [201] Constant Lestienne v Guillermo Garcia-Lopez [166] | 4-6,4-6 | |
| US Open | 08/22 16:25 | 45 | [201] Constant Lestienne v Alessandro Giannessi [149] | 6-3,6-0 | |
| US Open | 08/20 15:00 | 44 | [115] Matthias Bachinger v Constant Lestienne [201] | 6-7,6-3,5-7 | |
| Challenger Portoroz | 08/17 17:00 | 28 | [429] Viktor Durasovic v Constant Lestienne [219] | 3-6,6-1,6-1 | |
| Challenger Portoroz | 08/16 15:00 | 27 | [219] Constant Lestienne v Artem Dubrivnyy [487] | Retired | |
| Challenger Portoroz | 08/15 18:20 | 26 | [219] Constant Lestienne v Matteo Viola [245] | 6-0,6-1 | |
| Challenger Portoroz | 08/14 08:00 | 25 | [219] Constant Lestienne v Julian Ocleppo [458] | 6-1,6-2 | |
| Challenger Augsburg | 08/06 12:00 | 25 | [180] Constant Lestienne v Carlos Taberner [347] | 2-6,1-6 | |
| Challenger Segovia | 08/02 13:35 | 27 | [189] Constant Lestienne v Pavel Kotov [287] | 6-2,3-6,6-7 | |
| Challenger Segovia | 08/01 14:05 | 26 | [189] Constant Lestienne v Tobias Simon [437] | 7-6,6-2 | |
| Challenger Segovia | 07/30 14:20 | 25 | [189] Constant Lestienne v Andres Artunedo Martinavarro [390] | 6-4,6-1 | |
| Challenger Prague | 07/25 09:50 | 26 | [229] Bernabe Zapata Miralles v Constant Lestienne [196] | 6-3,6-7,7-6 | |
| Challenger Prague | 07/23 13:15 | 25 | [371] Pedro Sakamoto v Constant Lestienne [196] | 4-6,5-7 | |
| ATP Bastad | 07/16 09:00 | 25 | [198] Constant Lestienne v Albert Ramos-Vinolas [99] | 1-6,5-7 | |
| ATP Bastad | 07/15 09:00 | 164 | [295] Laurynas Grigelis v Constant Lestienne [198] | 6-1,2-6,1-6 | |
| ATP Bastad | 07/14 08:30 | 64 | John H Lithen v Constant Lestienne | 0-6,6-7 | |
| Challenger Ludwigshafen | 07/05 11:00 | 27 | [199] Constant Lestienne v Filip Horansky [181] | 4-6,6-3,5-7 | |
| Challenger Ludwigshafen | 07/04 12:55 | 26 | [97] Henri Laaksonen v Constant Lestienne [199] | 6-7,6-7 | |
| Challenger Ludwigshafen | 07/03 14:55 | 25 | [265] Thiemo De Bakker v Constant Lestienne [199] | 3-6,4-6 | |
| Challenger Ludwigshafen | 07/02 12:00 | 24 | [399] Javier Barranco Cosano v Constant Lestienne [199] | 2-6,4-6 | |
| Wimbledon | 06/24 12:05 | 44 | [111] Kamil Majchrzak v Constant Lestienne [202] | 6-1,6-2 | |
| Challenger Blois | 06/20 16:15 | 26 | [204] Constant Lestienne v Daniel Elahi Galan [197] | 4-6,4-6 | |
| Challenger Blois | 06/19 16:00 | 25 | Constant Lestienne v Holger Vitus Nodskov Rune | 6-4,6-3 | |
| Challenger Lyon | 06/12 13:40 | 25 | [206] Constant Lestienne v Alexey Vatutin [208] | 6-7,6-1,1-6 | |
| Challenger Poznan | 06/04 08:00 | 24 | [192] Constant Lestienne v Sumit Nagal [280] | 3-6,7-5,3-6 | |
| French Open | 05/20 08:00 | 44 | [184] Yannick Hanfmann v Constant Lestienne [196] | 6-2,7-5 |