Pompey lost their lead at Oxford to draw in League One for the fourth game in succession.
A superb free-kick from Marlon saw John Mousinho's side take the lead midway through the first half.
But Sam Long soon nodded home a Cameron Brannagan corner to ensure the spoils would be shared.
Fans can watch the key moments (top video) or register with iFollow for extended highlights (middle video) and a full match replay (bottom video).
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