Match ends, Oxford United 3, Mansfield Town 0.
Alex MacDonald scored twice as Oxford United eased their relegation fears and leapfrogged Mansfield in the table.
MacDonald sidefooted home on the half-hour mark after goalkeeper Lenny Pidgeley failed to deal with George Baldock's right-wing cross.
He bagged his second after the break when he fired home from 15 yards.
Danny Hylton grabbed a third for Michael Appleton's side from the penalty spot, after Ryan Tafazolli fouled Michael Hoban in the box.
The result means Mansfield slip to 19th, four points above the drop zone, while Oxford move up to 17th.
Mansfield Town manager Adam Murray told BBC Radio Nottingham:
"We went out there today and looked liked we were treading water from the first minute.
"I'm not going to get down today because I looked at the run of fixtures we had and I knew this would be our toughest one.
"We knew as a group we were going to be up against it, and it looked like we had no energy and didn't grab the game by the scruff of the neck and we paid the price for it."
- 11MacDonaldSubstituted forRoofeat 71'minutes
- 19CollinsSubstituted forWhingat 88'minutes
- 10HyltonBooked at 53minsSubstituted forRobertsat 76'minutes
- 6TafazolliBooked at 58mins
- 20ThomasBooked at 20minsSubstituted forBinghamat 45'minutes
- 24BrownSubstituted forLambeat 75'minutes
- 25OliverSubstituted forKeeat 72'minutes
- Andy Woolmer
- Shots on Target
Second Half ends, Oxford United 3, Mansfield Town 0.
Billy Kee (Mansfield Town) wins a free kick in the defensive half.
Foul by Pat Hoban (Oxford United).
Corner, Oxford United. Conceded by Martin Riley.
Substitution, Oxford United. Andrew Whing replaces Michael Collins because of an injury.
Foul by Josh Ruffels (Oxford United).
Rakish Bingham (Mansfield Town) wins a free kick in the defensive half.
Foul by Sam Long (Oxford United).
Jeffrey Monakana (Mansfield Town) wins a free kick in the defensive half.
Attempt blocked. Pat Hoban (Oxford United) right footed shot from the right side of the box is blocked.
Attempt missed. James Roberts (Oxford United) right footed shot from the centre of the box is high and wide to the right.
Attempt missed. James Roberts (Oxford United) with an attempt from the centre of the box is close, but misses to the left.
Substitution, Oxford United. James Roberts replaces Danny Hylton.
Substitution, Mansfield Town. Reggie Lambe replaces Junior Brown.
Hand ball by Danny Hylton (Oxford United).
Substitution, Mansfield Town. Billy Kee replaces Vadaine Oliver.
Substitution, Oxford United. Kemar Roofe replaces Alexander MacDonald because of an injury.
Corner, Oxford United. Conceded by Junior Brown.
Goal! Oxford United 3, Mansfield Town 0. Danny Hylton (Oxford United) converts the penalty with a right footed shot to the bottom left corner.