| Challenger Praga | 05/01 08:30 | 14 | Jakub Mensik v Tristan Lamasine | Retired | |
| Challenger Praga | 04/19 11:20 | 25 | [313] Lucas Miedler v Tristan Lamasine [299] | 2-6,6-2,6-3 | |
| Challenger Praga | 04/18 08:30 | 19 | [299] Tristan Lamasine v Nicholas D Ionel [360] | 4-6,2-6 | |
| Challenger Praga | 04/17 08:30 | 14 | [299] Tristan Lamasine v Peter Heller [453] | 6-2,7-5 | |
| Challenger Madrid | 04/10 10:50 | 45 | [340] Oleksii Krutykh v Tristan Lamasine [299] | 7-6,6-3 | |
| Challenger Oeiras | 04/07 09:30 | 26 | [153] Christopher O'Connell v Tristan Lamasine [299] | 6-3,6-4 | |
| Challenger Oeiras | 04/05 13:10 | 25 | [299] Tristan Lamasine v Alex Rybakov [366] | 6-3,2-6,7-6 | |
| Challenger St Brieuc | 03/30 13:10 | 25 | [288] Tristan Lamasine v Quentin Halys [115] | 2-6,2-6 | |
| Challenger Lilla | 03/21 12:20 | 19 | [286] Tristan Lamasine v Arthur Fils [482] | 6-3,2-6,2-6 | |
| Challenger Lilla | 03/20 09:00 | 14 | Tristan Lamasine v Thomas Deschamps | 6-4,7-6 | |
| Challenger Torino | 02/27 16:40 | 45 | [293] Tristan Lamasine v Albano Olivetti [124] | 7-6,5-7,6-7 | |
| Challenger Cherbourg | 02/09 15:35 | 26 | [301] Tristan Lamasine v Luca Van Assche [444] | Retired | |
| Challenger Cherbourg | 02/08 15:30 | 25 | [156] Lucas Pouille v Tristan Lamasine [301] | Retired | |
| Challenger Cherbourg | 02/07 13:15 | 19 | [238] Vitaliy Sachko v Tristan Lamasine [301] | 4-6,6-4,2-6 | |
| Challenger Cherbourg | 02/06 15:00 | 14 | [361] Matteo Arnaldi v Tristan Lamasine [301] | 6-7,4-6 | |
| Challenger Quimper | 01/23 10:35 | 14 | Shintaro Mochizuki v Tristan Lamasine | 6-3,6-3 | |
| Challenger Forlì | 01/17 09:00 | 19 | [309] Antoine Escoffier v Tristan Lamasine [298] | 6-2,6-1 | |
| Challenger Forlì - Qual. | 01/16 10:50 | 14 | [350] Sebastian Fanselow v Tristan Lamasine [288] | 4-6,6-3,3-6 | |
| Challenger Ismaning | 10/24 12:35 | 26 | [431] Johannes Haerteis v Tristan Lamasine [272] | 6-4,6-4 | |
| Challenger Barcellona | 10/05 08:00 | 25 | [164] Dmitry Popko v Tristan Lamasine [280] | 6-3,6-2 | |
| Challenger Lisbona | 09/28 10:55 | 25 | [196] Frederico F Silva v Tristan Lamasine [281] | 6-3,6-4 | |
| Challenger Rennes | 09/16 14:20 | 26 | [257] Tristan Lamasine v Arthur Rinderknech [77] | 6-7,2-6 | |
| Challenger Rennes | 09/13 12:50 | 25 | [211] Go Soeda v Tristan Lamasine [257] | 6-7,4-6 | |
| Challenger Kiev | 09/08 10:35 | 26 | [260] Tristan Lamasine v Franco Agamenone [291] | 6-3,2-6,4-6 | |
| Challenger Kiev | 09/06 09:35 | 25 | [260] Tristan Lamasine v Kaichi Uchida [354] | 7-6,6-2 | |
| Challenger Como | 08/31 08:00 | 25 | [135] Juan Manuel Cerundolo v Tristan Lamasine [260] | 6-4,7-6 | |
| Challenger Varsavia | 08/26 12:20 | 26 | [272] Nino Serdarusic v Tristan Lamasine [257] | 6-1,3-6,7-5 | |
| Challenger Varsavia | 08/25 10:00 | 25 | [125] Jan Zielinski v Tristan Lamasine [257] | 2-6,2-6 | |
| Challenger Luedenscheid | 08/18 10:45 | 26 | [269] Mirza Basic v Tristan Lamasine [257] | 7-6,6-2 | |
| Challenger Luedenscheid | 08/17 08:00 | 25 | Tristan Lamasine v Evgeny Karlovskiy | 6-3,6-3 |
Tristan Lamasine (Thiais, 5 marzo 1993) è un tennista francese. Ha ottenuto i migliori risultati in doppio, con diversi titoli nel circuito Challenger e l'85º posto del ranking ATP raggiunto nel giugno 2016. In singolare ha vinto un solo titolo Challenger ed è stato 181º della graduatoria mondiale nell'agosto 2015.