| Челленджер Гуанчжоу | 09/08 08:35 | 14 | Колин Синклер v Чженсюнг Дун | 0-1 | |
| ITF M15 Гонконг | 09/08 02:00 | 29 | Колин Синклер v Крис Родеш | 4-6,6-7 | |
| ITF M15 Гонконг | 09/07 06:45 | 28 | Колин Синклер v Samir Banerjee | 6-2,7-5 | |
| ITF M15 Гонконг | 09/06 10:40 | 27 | [331] Колин Синклер v Эдвард Винтер [315] | 6-7,6-3,10-5 | |
| ITF M15 Гонконг | 09/05 04:25 | 26 | Колин Синклер v Yan Cheng Chen | 6-4,6-3 | |
| ITF M15 Гонконг | 09/03 07:00 | 25 | Колин Синклер v Джимми Янг | 6-1,6-4 | |
| ITF Mужчины 25 - Гонrконг | 08/29 01:55 | 26 | [352] Woobin Шин v Колин Синклер [331] | 7-6,7-6 | |
| ITF Mужчины 25 - Гонrконг | 08/28 03:35 | 25 | Рен Накамура v Колин Синклер | 6-7,4-6 | |
| ITF M15 Huntsville | 08/15 15:00 | 27 | Колин Синклер v Лео Витунтьен | 6-7,6-4,5-7 | |
| ITF M15 Huntsville | 08/14 14:00 | 26 | Колин Синклер v Ильяс Милад Фахим | 6-4,6-1 | |
| ITF M15 Huntsville | 08/13 19:55 | 25 | Колин Синклер v Киан Вакили | 6-4,7-6 | |
| ITF M25 Саутхейвен | 08/08 21:55 | 26 | Лео Витунтьен v Колин Синклер | 6-7,6-3,7-6 |
Colin Sinclair (born December 19, 1994) is an American tennis player representing the Northern Mariana Islands.
He achieved a career best singles ranking of world No. 340 on 18 September 2023, and a career high doubles ranking of world No. 200 on 10 April 2023. He has won 2 singles titles on the ITF Futures Tour. Additionally, he has won 2 titles on ATP Challenger Tour and 7 titles on the ITF Futures Tour in doubles.
He represents the Northern Mariana Islands in Davis Cup as part of the Pacific Oceania team since 2017 and has a career record of 18–5 (13–3 in singles, 5–2 in doubles) in the competition. He has been coached by Jeff Race, Ian Malpass, and Silviu Tanasoiu.