| Result | Tournament |
|---|---|
| Ben Harrison defeated Michael Collumb | 2013 Q School - Event 3 Snooker |
| Jamie Rhys Clarke defeated Michael Collumb | 2013 Q School - Event 2 Snooker |
| Alex Davies defeated Michael Collumb | 2013 Q School - Event 1 Snooker |
| Ross Muir defeated Michael Collumb | 2012 European Tour - Event 5 Snooker |
| Michael Collumb defeated Stephen Baillie | 2012 European Tour - Event 5 Snooker |
| Sanderson Lam defeated Michael Collumb | 2012 EBSA Qualifying Tour - Scotland Snooker |
| Michael Collumb defeated Oliver Lines | 2012 EBSA Qualifying Tour - Scotland Snooker |
| Michael Collumb defeated Kishan Hirani | 2012 EBSA Qualifying Tour - Scotland Snooker |
| Michael Collumb defeated Ryan Causton | 2012 EBSA Qualifying Tour - Scotland Snooker |
| Michael Collumb defeated Chris Norbury | 2012 EBSA Qualifying Tour - Scotland Snooker |
| Chris Melling defeated Michael Collumb | 2009 PIOS - Event 7 Snooker |
| Xiao Guodong defeated Michael Collumb | 2009 PIOS - Event 6 Snooker |
| Adam Chalkley defeated Michael Collumb | 2008 PIOS - Event 5 Snooker |
| Mike Hallett defeated Michael Collumb | 2008 PIOS - Event 4 Snooker |
| Michael Collumb defeated Darren Bond | 2008 PIOS - Event 4 Snooker |
| Michael Collumb defeated James Murdoch | 2008 PIOS - Event 4 Snooker |
| Brian Cox defeated Michael Collumb | 2008 PIOS - Event 3 Snooker |
| Michael Collumb defeated Grant Cole | 2008 PIOS - Event 3 Snooker |
| Zhang Anda defeated Michael Collumb | 2008 PIOS - Event 2 Snooker |
| David Hogan defeated Michael Collumb | 2008 PIOS - Event 1 Snooker |