[127] John O'Shea 7-5,6-1 Tristan Lamasine [221] 2019-08-16 11:30
Stadium: Court Central Round: 25 Ground: Hardcourt indoor
Head to Head
| ATP Lyon | 2019/05/20 11:15 | Tristan Lamasine v Jannik Sinner | 6-0,7-6 |
| ATP Lyon | 2019/05/19 08:00 | Tristan Lamasine v Jannik Sinner | 4-6,3-6 |
| Challenger Bergamo | 2019/02/23 20:10 | Tristan Lamasine v Jannik Sinner | 2-6,3-6 |
Home History
| Challenger Aptos | 2019/08/08 01:00 | Jannik Sinner v Bjorn Fratangelo | 6-7,3-6 |
| Challenger Aptos | 2019/08/06 18:10 | Sem Verbeek v Jannik Sinner | 6-3,6-7,2-6 |
| Challenger Lexington | 2019/08/04 17:00 | Jannik Sinner v Alex Bolt | 6-4,3-6,6-4 |
| Challenger Lexington | 2019/08/03 19:10 | JC Aragone v Jannik Sinner | 2-6,4-6 |
| Challenger Lexington | 2019/08/02 23:40 | Jannik Sinner v Duckhee Lee | 4-6,6-3,6-1 |
| Challenger Lexington | 2019/08/01 19:20 | Jannik Sinner v Maxime Cressy | 6-4,6-7,6-1 |
| Challenger Lexington | 2019/07/30 17:05 | Jannik Sinner v Alexey Zakharov | 4-6,6-1,6-3 |
| Challenger Binghamton | 2019/07/25 21:00 | Jannik Sinner v Mitchell Krueger | 5-7,6-1,3-6 |
Away History
| Challenger Meerbusch | 2019/08/14 13:05 | Tristan Lamasine v Carlos Taberner | 7-6,4-6,2-6 |
| Challenger Sopot | 2019/08/03 09:00 | Stefano Travaglia v Tristan Lamasine | 6-1,7-5 |
| Challenger Sopot | 2019/08/02 09:00 | Tristan Lamasine v Alexey Vatutin | 3-6,7-5,6-2 |
| Challenger Sopot | 2019/08/01 09:00 | Mikael Ymer v Tristan Lamasine | 6-2,4-6,1-6 |
| Challenger Sopot | 2019/07/30 13:55 | Andrea Pellegrino v Tristan Lamasine | 7-5,4-6,4-6 |
| Challenger Prague | 2019/07/23 11:15 | Tristan Lamasine v Vaclav Safranek | 6-7,1-6 |
| Challenger Perugia | 2019/07/10 19:25 | Paolo Lorenzi v Tristan Lamasine | 6-1,7-6 |
| Challenger Perugia | 2019/07/08 12:25 | Tristan Lamasine v Santiago Giraldo | 7-5,6-7,7-6 |