Two goals in four minutes midway through the first half helped Oxford to a 3-1 Sky Bet League One win over Charlton, Dean Holdenâs first defeat as the Addicksâ new boss.
Billy Bodin converted Josh Murphyâs inviting low cross into the roof of the net at the far post in the 20th minute for his seventh goal of the season.
From Oxfordâs next real attack, Matty Taylor deflected Bodinâs shot past goalkeeper Ashley Maynard-Brewer to make it two.
Substitute Miles Leaburn pulled a goal back for Charlton in the 67th minute, heading home Corey Blackett-Taylorâs cross following the wingerâs blistering run down the left.
But soon after his 81st minute arrival, teenage substitute Gatlin OâDonkor sealed victory for Oxford by prodding the ball over the line from a yard out, after Maynard-Brewer failed to hold Yanic Wildschutâs shot.
Karl Robinsonâs team had been unlucky when Cameron Brannaganâs 22 yard shot from a free-kick played short smashed against the bar â but it was still a strong response after their heavy Boxing Day defeat at Ipswich.