Davis Kupa 07/17 07:20 1 Kareem Al Allaf v Colin Sinclair 4-6,0-6
ITF Belgium F4 Qual 07/08 16:20 62 Maxence Broville v Colin Sinclair 6-4,6-2
ITF Belgium F3 07/06 11:00 26 Colin Sinclair v Alexis Musialek 6-3,2-6,1-6
ITF Belgium F3 07/04 14:35 25 Simon Navarro v Colin Sinclair 6-7,7-6,2-6
ITF Belgium F3 Qual 07/03 11:00 62 Colin Sinclair v Teodor Giusca 6-3,1-6,6-3
ITF Belgium F3 Qual 07/02 08:00 62 Constant De La Bassetiere v Colin Sinclair 4-6,2-6
ITF Belgium F3 Qual 07/01 10:00 62 Mark S Meyer v Colin Sinclair 0-6,1-6
ITF USA F20 06/22 00:55 25 Julian Zlobinsky v Colin Sinclair 1-6,7-6,6-3
ITF USA F20 06/19 17:00 62 Colin Sinclair v Alex Kobelt 4-6,6-4,6-4
ITF USA F20 06/18 16:00 62 Felipe Ramirez Luna v Colin Sinclair 5-7,2-6
ITF USA F18 06/14 17:50 25 Colin Sinclair v Samuel Monette 6-4,4-6,2-6
ITF USA F18 06/12 16:00 62 Colin Sinclair v Mark Oljaca 6-2,6-1
ITF USA F3 01/08 17:30 60 Aleksandar Kovacevic v Colin Sinclair 6-4,6-2
ITF USA F3 01/07 18:30 60 Carlos Ramirez Utermann v Colin Sinclair 3-6,6-4,4-6
ITF USA F20 Qual 06/29 17:30 - Mikael Torpegaard v Colin Sinclair 6-2,6-2
ITF USA F18 06/22 16:00 - Dominic Cotrone v Colin Sinclair 7-6,6-1

Colin Sinclair (born December 19, 1994) is a Northern Mariana Islander tennis player.

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 his country 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.