Sheffield United maintained their automatic League One promotion bid with second-half goals from Michael Doyle and Dave Kitson at Oldham.
The Blades went in front on 57 minutes when Dominic Poleon's shot was half-saved by Alex Cisak, only for Doyle to put away the rebound from 12 yards.
Oldham almost levelled when Matt Smith headed Lee Croft's cross inches wide before his 18-yard shot was saved.
But United sealed the points late on with Kitson's 10th goal of the season.
Cisak charged off his line and failed to gather Tony McMahon's free-kick, giving Kitson the chance to head into an empty net from 14 yards.
The Blades' sixth game without defeat, to cap boss Danny Wilson's 100th game in charge, keeps them within a point of leaders Doncaster Rovers and two ahead of Swindon Town on a day when all the top three won.
But, in the week when they also exited the FA Cup, managerless Oldham's first defeat in four league games plunges them back into the bottom four.
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Oldham caretaker manager Tony Philliskirk told BBC Radio Manchester:
"There was nothing between the teams on today, but two individual errors have cost us the game.
"We know that we've got a massive game next week at Tranmere, but it's in our hands.
"It's disappointing to drop back into the bottom four, but it's going to be nip and tuck for the rest of the season. The sooner we get those wins, the better."
Sheffield United first-team coach Chris Morgan told BBC Radio Sheffield:
"It's a great result for us, coming away from home against Oldham, who have done fantastically well over the last couple of weeks.
"They've got a lot of confidence from the games against Liverpool and the two games against Everton.
"We knew it was going to be tough. It's never an easy place to come, and at half time we just said keep going, keep the shape, be resilient and we knew we'd get a chance.
"The chance came and when you get them you've got to take them."
"So really pleased to come away and get another win."
Live text and stats
Saturday, 2 March 2013
02 Brown (Iwelumo 78)
05 Mvoto yellow card
04 Wesolowski (Obita 65)
10 Simpson yellow card
20 Baxter yellow card
08 Doyle yellow card
11 McDonald yellow card
14 Kitson yellow card
22 Poleon (McFadzean 71)
36 De Girolamo,
Ref: WoolmerAtt: 6,426
Attempts on target
Attempts off target
90:00+4:14 The referee blows his whistle to end the game.
90:00+3:36 Foul by Dave Kitson on Dean Furman, free kick awarded. James Tarkowski restarts play with the free kick.
90:00+2:26 The referee penalises Chris Iwelumo for handball. Matthew Hill takes the direct free kick.
90:00+1:09 Corner taken short by Kevin McDonald.
Correction - 90:00+0:47 Effort from the edge of the penalty box by Michael Doyle goes wide of the right-hand upright.
90:00+0:47 Michael Doyle has an effort at goal from the edge of the area that misses to the right of the target.
90:00+0:23 Corner from right by-line taken by Jonathan Grounds.
90:00+0:02 Matt Smith takes a shot.
87:22 Corner taken right-footed by Jose Baxter to the near post, James Tarkowski produces a right-footed shot from close in that
clears the bar.
86:24 Booking Dave Kitson receives a yellow card for leaving the field of play without the referee's permission.
85:17 The assist for the goal came from Tony McMahon.
85:17 GOAL - Dave Kitson:Oldham 0 - 2 Sheffield Utd Dave Kitson finds the back of the net with a headed goal from just inside the box. Oldham 0-2 Sheff Utd.
84:42 Free kick awarded for a foul by Jean Yves Mvoto on Dave Kitson. Tony McMahon restarts play with the free kick.
84:13 Jordan Obita gives away a free kick for an unfair challenge on Tony McMahon. George Long restarts play with the free kick.
83:37 Barry Robson gives away a free kick for an unfair challenge on Jose Baxter. Alex Cisak takes the direct free kick.
82:45 Neill Collins takes a shot. Clearance by Dean Furman.
82:14 Free kick crossed by Barry Robson.
82:14 Booking Caution for Jose Baxter.
82:04 Free kick awarded for an unfair challenge on Ryan Flynn by Jose Baxter.
81:43 Inswinging corner taken from the right by-line by Jonathan Grounds.
81:15 Matt Smith takes a shot. Save by George Long.
80:06 Outswinging corner taken left-footed by Barry Robson, Headed effort on goal by Harry Maguire from just inside the box goes
harmlessly over the goal.
79:01 Matt Smith gives away a free kick for an unfair challenge on Harry Maguire. Free kick taken by George Long.
77:56 James Tarkowski fouled by Dave Kitson, the ref awards a free kick. Direct free kick taken by James Tarkowski.
77:16 Substitution Chris Iwelumo is brought on as a substitute for Connor Brown.
76:35 Jose Baxter fouled by Kevin McDonald, the ref awards a free kick. Jose Baxter takes the free kick.
74:51 Matt Smith takes a shot.
73:04 Free kick taken by Alex Cisak.
73:04 Booking Booking for Kevin McDonald for unsporting behaviour.
72:53 Free kick awarded for an unfair challenge on Jose Baxter by Kevin McDonald.
72:09 Unfair challenge on Tony McMahon by Jordan Obita results in a free kick. Free kick taken by George Long.
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