| Result | Tournament |
|---|---|
| Alex Davies defeated David Portman | 2011 Q School - Event 3 Snooker |
| David Portman defeated James Wattana | 2011 Q School - Event 3 Snooker |
| Bash Maqsood defeated David Portman | 2011 Q School - Event 2 Snooker |
| Zhang Anda defeated David Portman | 2011 Q School - Event 1 Snooker |
| David Portman defeated Sam Baird | 2011 Q School - Event 1 Snooker |
| Fergal O'Brien defeated David Portman | 2010 PTC - Event 4 Snooker |
| David Portman defeated Kamran Ashraf | 2010 PTC - Event 4 Snooker |
| David Portman defeated Jamie Barrett | 2010 PTC - Event 4 Snooker |
| Daniel Wells defeated David Portman | 2010 PTC - Event 3 Snooker |
| David Portman defeated Terry Challenger | 2010 PTC - Event 3 Snooker |
| David Grace defeated David Portman | 2010 PTC - Event 2 Snooker |
| Justin Astley defeated David Portman | 2010 PIOS - Event 8 Snooker |
| David Portman defeated Vinnie Calabrese | 2010 PIOS - Event 8 Snooker |
| Justin Astley defeated David Portman | 2010 PIOS - Event 7 Snooker |
| David Portman defeated Kevin van Hove | 2010 PIOS - Event 7 Snooker |
| Kishan Hirani defeated David Portman | 2010 PIOS - Event 6 Snooker |
| David Craggs defeated David Portman | 2009 PIOS - Event 8 Snooker |
| Lee Page defeated David Portman | 2009 PIOS - Event 7 Snooker |
| David Portman defeated Joe Jogia | 2009 PIOS - Event 7 Snooker |
| David Portman defeated Justin Astley | 2009 PIOS - Event 7 Snooker |
| David Portman defeated Kyren Wilson | 2009 PIOS - Event 7 Snooker |
| David Portman defeated Adam Duffy | 2009 PIOS - Event 7 Snooker |
| David Portman defeated Stephen Ellis | 2009 PIOS - Event 7 Snooker |
| Jack Lisowski defeated David Portman | 2009 PIOS - Event 6 Snooker |
| David Portman defeated Craig Waddingham | 2009 PIOS - Event 6 Snooker |
| Robert Valiant defeated David Portman | 2009 PIOS - Event 5 Snooker |
| David Portman defeated Adam Duffy | 2009 PIOS - Event 5 Snooker |
| David Portman defeated Richard Clark | 2009 PIOS - Event 5 Snooker |
| David Portman defeated Oliver Brown | 2009 PIOS - Event 5 Snooker |
| David Portman defeated Sydney Wilson | 2009 PIOS - Event 5 Snooker |
| Jak Jones defeated David Portman | 2009 PIOS - Event 4 Snooker |
| David Portman defeated Aditya Mehta | 2009 PIOS - Event 4 Snooker |
| David Portman defeated John Astley | 2009 PIOS - Event 4 Snooker |
| David Portman defeated Stuart Watson | 2009 PIOS - Event 4 Snooker |
| David Portman defeated Marc Harman | 2009 PIOS - Event 4 Snooker |
| Alfie Burden defeated David Portman | 2009 PIOS - Event 3 Snooker |
| Jeff Cundy defeated David Portman | 2009 PIOS - Event 2 Snooker |
| Ian Ali defeated David Portman | 2009 PIOS - Event 1 Snooker |
| Alex Borg defeated David Portman | 2008 PIOS - Event 5 Snooker |
| Stephen Wycherley defeated David Portman | 2008 PIOS - Event 4 Snooker |
| Anthony McGill defeated David Portman | 2008 PIOS - Event 3 Snooker |
| David Portman defeated Stewart Watson | 2008 PIOS - Event 3 Snooker |
| Jason Bates defeated David Portman | 2008 PIOS - Event 2 Snooker |
| Bjorn Haneveer defeated David Portman | 2008 PIOS - Event 1 Snooker |
| David Portman defeated Robert Carlisle | 2008 PIOS - Event 1 Snooker |