Oxford Utd 2-1 Rotherham
Oxford United stayed in the play-off places courtesy of a victory over Rotherham, whose own top-seven challenge now looks in major jeopardy.
United took the lead when Scott Rendell coolly finished Peter Leven's ball.
Midfielder Asa Hall doubled their lead when he fired Andy Whing's pull-back into the roof of the net.
The Millers got one back when Adam Chapman fouled Jason Taylor in the box and Lewis Grabban fired home what proved to be just a consolation.