| Result | Tournament |
|---|---|
| Rory McLeod defeated Sean O'Sullivan | 2013 Wuxi Classic Snooker |
| Alfie Burden defeated Sean O'Sullivan | 2013 World Open Snooker |
| Sean O'Sullivan defeated Paul Davison | 2013 World Open Snooker |
| Michael Wasley defeated Sean O'Sullivan | 2013 World Championship Snooker |
| Anthony Hamilton defeated Sean O'Sullivan | 2013 Welsh Open Snooker |
| Alfie Burden defeated Sean O'Sullivan | 2013 German Masters Snooker |
| Marco Fu defeated Sean O'Sullivan | 2013 European Tour - Event 6 Snooker |
| Matthew Stevens defeated Sean O'Sullivan | 2013 European Tour - Event 1 Snooker |
| Sean O'Sullivan defeated Joe Perry | 2013 European Tour - Event 1 Snooker |
| Sean O'Sullivan defeated Ryan Clark | 2013 European Tour - Event 1 Snooker |
| Rory McLeod defeated Sean O'Sullivan | 2013 China Open Snooker |
| Sean O'Sullivan defeated Alfie Burden | 2013 China Open Snooker |
| Sean O'Sullivan defeated Craig Steadman | 2013 China Open Snooker |
| Chen Zhe defeated Sean O'Sullivan | 2013 Australian Open Snooker |
| Sean O'Sullivan defeated Sanderson Lam | 2013 Australian Open Snooker |
| Tony Drago defeated Sean O'Sullivan | 2012 Wuxi Classic Snooker |
| Chen Zhe defeated Sean O'Sullivan | 2012 UK Championship Snooker |
| Tian Pengfei defeated Sean O'Sullivan | 2012 Shanghai Masters Snooker |
| Tony Knowles defeated Sean O'Sullivan | 2012 Q School - Event 3 Snooker |
| Sean O'Sullivan defeated Ryan Causton | 2012 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Michael Wild | 2012 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Mohammed Al Shaikh | 2012 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Nick Dyson | 2012 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Christopher Keogan | 2012 Q School - Event 2 Snooker |
| Stuart Carrington defeated Sean O'Sullivan | 2012 Q School - Event 1 Snooker |
| Thepchaiya Un-Nooh defeated Sean O'Sullivan | 2012 PTC - Event 4 Snooker |
| Allister Carter defeated Sean O'Sullivan | 2012 PTC - Event 3 Snooker |
| Pankaj Advani defeated Sean O'Sullivan | 2012 PTC - Event 2 Snooker |
| Ryan Day defeated Sean O'Sullivan | 2012 PTC - Event 1 Snooker |
| Travis Furnish defeated Sean O'Sullivan | 2012 Pink Ribbon Snooker |
| Ian Burns defeated Sean O'Sullivan | 2012 International Championship Snooker |
| Martin O'Donnell defeated Sean O'Sullivan | 2012 European Tour - Event 5 Snooker |
| Sean O'Sullivan defeated Jack Lisowski | 2012 European Tour - Event 5 Snooker |
| Ben Woollaston defeated Sean O'Sullivan | 2012 European Tour - Event 4 Snooker |
| Jimmy Robertson defeated Sean O'Sullivan | 2012 European Tour - Event 3 Snooker |
| Sean O'Sullivan defeated David Gilbert | 2012 European Tour - Event 3 Snooker |
| Jamie Burnett defeated Sean O'Sullivan | 2012 European Tour - Event 2 Snooker |
| Mark Selby defeated Sean O'Sullivan | 2012 European Tour - Event 1 Snooker |
| Ian Burns defeated Sean O'Sullivan | 2012 Australian Open Snooker |
| Thepchaiya Un-Nooh defeated Sean O'Sullivan | 2011 Q School - Event 3 Snooker |
| Tian Pengfei defeated Sean O'Sullivan | 2011 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Shaun Wilkes | 2011 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated James Hill | 2011 Q School - Event 2 Snooker |
| Sean O'Sullivan defeated Yu Delu | 2011 Q School - Event 2 Snooker |
| Mike Hallett defeated Sean O'Sullivan | 2011 Q School - Event 1 Snooker |
| Sean O'Sullivan defeated James Wattana | 2011 Q School - Event 1 Snooker |
| Martin Ball defeated Sean O'Sullivan | 2011 PTC - Event 9 Snooker |
| Sean O'Sullivan defeated Koen Walraet | 2011 PTC - Event 9 Snooker |
| Anthony McGill defeated Sean O'Sullivan | 2011 PTC - Event 8 Snooker |
| Sean O'Sullivan defeated Robert Murphy | 2011 PTC - Event 8 Snooker |