| Challenger Brisbane | 02/09 00:00 | 19 | Jamie Mackenzie v Colin Sinclair | 6-2,4-6,4-6 | |
| Challenger Brisbane Qual | 02/08 00:15 | 14 | Enzo Aguiard v Colin Sinclair | 6-7,6-7 | |
| Challenger Brisbane | 02/02 00:00 | 19 | Shunsuke Mitsui v Colin Sinclair | 7-6,6-7,6-4 | |
| Challenger Brisbane | 02/01 02:35 | 14 | Matsui/Rungkat v Colin Sinclair | 3-6,2-6 | |
| Challenger Noumea | 01/05 03:00 | 25 |
[287] Colin Sinclair v
Dan Added
[201]
|
3-6,7-6,2-6 | |
| Challenger Manama | 11/26 07:00 | 25 | Colin Sinclair v Toby Samuel | 3-6,0-6 | |
| Challenger Manama | 11/24 08:25 | 19 | [476] Semen Pankin v Colin Sinclair [259] | 6-4,6-4 | |
| Challenger Manama | 11/23 11:35 | 14 | Elyas Abdulnabi v Colin Sinclair | 1-6,1-6 | |
| Challenger Brisbane | 11/09 02:40 | 14 |
Hayden Jones
v
Colin Sinclair |
7-6,7-6 | |
| ITF M25 Brisbane | 10/29 06:44 | - | Yuichiro Inui v Colin Sinclair | 4-6,7-6,6-4 | |
| ITF M25 Brisbane | 10/22 22:00 | - |
Colin Sinclair v
Alexander Shevchenko
|
View | |
| ITF M25 Brisbane | 10/22 00:00 | - |
Colin Sinclair v
Alexander Klintcharov
|
4-6,4-6 |
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 doubles ranking of No. 200 on 10 April 2023.
Sinclair has won four ATP Challenger and eight ITF Tour doubles titles. Additionally, he has won three singles ITF titles. 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.