| Challenger Koblenz - Qual. | 01/14 15:15 | 45 | Clement Geens v Tristan Lamasine | 2-6,6-2,6-4 | |
| Challenger Mouilleron Le Captif Qual | 11/05 17:30 | 46 | Tristan Lamasine v Wesley Koolhof | Walkover | |
| Challenger Brest | 10/25 10:35 | 26 | Corentin Moutet v Tristan Lamasine | 6-4,6-7,6-3 | |
| Challenger Brest | 10/24 09:00 | 25 | [194] Illya Marchenko v Tristan Lamasine [298] | 5-7,3-6 | |
| Challenger Brest - Qual. | 10/23 09:00 | 54 | Quentin Robert v Tristan Lamasine | Retired | |
| Challenger Brest - Qual. | 10/22 10:45 | 46 | Constant Lestienne v Tristan Lamasine | 6-3,5-7,3-6 | |
| Challenger Ismaning | 10/20 16:50 | 27 | [325] Tristan Lamasine v Yannick Hanfmann [132] | 1-6,2-6 | |
| Challenger Ismaning | 10/18 13:20 | 26 | Igor Sijsling v Tristan Lamasine | 6-4,1-6,6-7 | |
| Challenger Ismaning | 10/17 08:30 | 25 | [208] Volodymyr Uzhylovskyi v Tristan Lamasine [325] | Retired | |
| Challenger Ismaning | 10/17 08:00 | - | Corentin Moutet v Tristan Lamasine | Cancelled | |
| Challenger Ortisei | 10/10 08:30 | 25 | [278] Matteo Viola v Tristan Lamasine [329] | 7-6,5-7,7-5 | |
| ITF Francia F22 | 10/04 10:00 | 25 | [322] Tristan Lamasine v Jules Okala [482] | 4-6,0-6 | |
| Challenger Orleans - Qual. | 09/24 14:15 | 54 | [273] Tristan Lamasine v Fabien Reboul [397] | 4-6,4-6 | |
| Challenger Orleans - Qual. | 09/23 17:00 | 46 | Tristan Lamasine v Victor Ouvrard | 6-3,6-4 | |
| ITF Francia F20 | 09/21 11:00 | 26 | Tristan Lamasine v Igor Sijsling | 2-6,6-3,0-6 | |
| ITF Francia F20 | 09/19 09:00 | 25 | Tristan Lamasine v Julien Eon | 7-6,6-2 | |
| ITF Francia F19 | 09/15 10:00 | 27 | [271] Tristan Lamasine v Edward Corrie [394] | 4-6,6-3,3-6 | |
| ITF Francia F19 | 09/14 12:15 | 26 | Tristan Lamasine v Dan Added | 6-7,7-5,6-3 | |
| ITF Francia F19 | 09/13 09:50 | 25 | Tristan Lamasine v Mats Rosenkranz | 3-6,6-3,6-3 | |
| ITF Francia F18 | 09/04 18:45 | 25 | [377] Sam Barry v Tristan Lamasine [265] | 6-3,6-2 | |
| Challenger Manerbio | 08/21 10:00 | 25 | [263] Tristan Lamasine v Marek Jaloviec [274] | 4-6,2-6 | |
| Challenger - Meerbusch | 08/14 11:30 | 25 | [263] Tristan Lamasine v Bernabe Zapata Miralles [289] | 2-6,5-7 | |
| Challenger Liberec | 07/31 09:00 | 25 | [255] Tristan Lamasine v Guilherme Clezar [264] | 6-1,1-6,4-6 | |
| Challenger Tampere | 07/25 13:50 | 25 | [253] Tristan Lamasine v Alexey Vatutin [183] | 6-7,7-5,4-6 | |
| ATP Bastad - Qual. | 07/17 09:00 | 45 | [225] Tristan Lamasine v Leonardo Mayer [134] | 6-7,7-6,2-6 | |
| Challenger Bastad | 07/11 12:20 | 25 | [198] Tristan Lamasine v Henri Laaksonen [104] | 1-6,4-6 | |
| Wimbledon - Qual. | 06/26 11:30 | 44 | [124] Ruben Bemelmans v Tristan Lamasine [196] | 3-6,6-1,6-3 | |
| Challenger Blois | 06/20 08:00 | 25 | [194] Tristan Lamasine v Jonathan Eysseric [277] | 6-3,4-6,4-6 | |
| Challenger Lione | 06/17 12:10 | 28 | [213] Tristan Lamasine v Mathias Bourgue [171] | 2-6,1-6 | |
| Challenger Lione | 06/16 13:00 | 27 | [47] Horacio Zeballos v Tristan Lamasine [213] | 7-5,5-7,4-6 |
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.