Cameron Brannagan scored six goals for Oxford last season
Oxford United continued their unbeaten start to the League One season as Cameron Brannagan's volley was enough to beat Peterborough.
The hosts started strongly, Tariqe Fosu striking the outside of the post from a tight angle before Brannagan's first-time 20-yard shot gave Posh goalkeeper Christy Pym no chance.
Peterborough improved after making two half-time changes, Marcus Maddison forcing U's keeper Simon Eastwood to tip his long-range effort over the bar.
Oxford should have doubled their lead when James Henry's shot came off the bar and fell to on-loan Liverpool forward Ben Woodburn, who somehow failed to hit the target.
Darren Ferguson's visitors have lost their opening two League One matches, while the U's move onto four points after drawing at Sunderland on the opening day.
The teams will meet again at the Kassam Stadium on Tuesday in the first round of the EFL Cup.
