Marcus Harness fired the Blues into the lead, before Jordan Willis and Chris Maguire turned the tables for the hosts.
5. Sunderland v Portsmouth
Andy Cannon tries to run between Sunderland's Max Power and Grant Leadbitter Photo: Malcolm Mackenzie
6. Sunderland v Portsmouth
Portsmouth manager Kenny Jackett Photo: Malcolm Mackenzie
7. Sunderland v Portsmouth
Andy Cannon shields the ball from Grant Leadbitter Photo: Malcolm Mackenzie
8. Sunderland v Portsmouth
Christian Burgess clears the ball Photo: Malcolm Mackenzie