Jonathan Howson and Mike Grella grabbed the goals to send Leeds into the second round of the FA Cup with a simple win.
Howson set the League One leaders on their way with a powerful first-half strike which took a slight deflection before flying in from 20 yards.
That came after Oldham's best chance of the match, Joe Colbeck failing to control with the goal at his mercy.
And Leeds controlled matters before Grella wrapped it up in injury time, turning in Aidan White's cross.
Leeds boss Simon Grayson told BBC Radio Leeds:
"I thought we limited Oldham to very few chances and when we had to defend, we defended properly.
"You give yourself a foundation to build off when you have defenders who don't like conceding goals and we have players in the team who can win us games, and that's what's happened tonight."
Live text and stats
Saturday, 7 November 2009
The FA Cup
14 Furman yellow card (Brooke 80)
28 Colbeck (Whitaker 37)
08 Smalley yellow card
17 Parker (Lee 72)
04 Doyle yellow card (White 90+1)
08 Kilkenny yellow card
14 Howson yellow card
09 Beckford (Grella 86)
Ref: WardAtt: 5,552
Attempts on target
Attempts off target
90:00+4:47 The referee blows for the end of the match.
90:00+3:11 The assist for the goal came from Aidan White.
90:00+3:11 GOAL - Mike Grella:Oldham 0 - 2 Leeds United Mike Grella grabs a goal from close in to the top left corner of the goal. Oldham 0-2 Leeds.
90:00+2:28 Andy Hughes concedes a free kick for a foul on Kieran Lee. The free kick is delivered left-footed by Lee Hills from right
wing, Richard Naylor makes a clearance.
90:00+0:59 Substitution Aidan White replaces Michael Doyle.
90:00+0:37 Robert Snodgrass is ruled offside. Free kick taken by Darryl Flahavan.
90:00+0:20 Booking Michael Doyle receives a caution.
89:39 Unfair challenge on Bradley Johnson by Alex Marrow results in a free kick. Free kick taken by Michael Doyle.
87:01 Effort from outside the penalty box by Ryan Brooke goes wide right of the target.
86:28 Free kick awarded for an unfair challenge on Sean Gregan by Robert Snodgrass. Reuben Hazell takes the free kick.
85:39 Substitution Mike Grella joins the action as a substitute, replacing Jermaine Beckford.
85:00 Casper Ankergren takes the free kick.
85:00 Booking Deane Smalley is cautioned.
84:51 Free kick awarded for an unfair challenge on Andy Hughes by Deane Smalley.
83:43 Bradley Johnson has an effort at goal from just outside the box which goes wide of the right-hand upright.
82:28 Ryan Brooke concedes a free kick for a foul on Jonathan Howson. Richard Naylor restarts play with the free kick.
82:06 Foul by Robert Snodgrass on Danny Whitaker, free kick awarded. Sean Gregan takes the direct free kick.
80:53 Centre by Chris Taylor, Richard Naylor manages to make a clearance.
79:45 Darryl Flahavan restarts play with the free kick.
79:45 Substitution Ryan Brooke replaces Dean Furman.
79:45 Jermaine Beckford is caught offside.
75:32 Jermaine Beckford handles the ball and concedes a free kick. Reuben Hazell takes the free kick.
74:32 Alex Marrow has an effort at goal from outside the area which goes wide right of the goal.
72:54 Outswinging corner taken left-footed by Bradley Johnson from the left by-line, Lee Hills manages to make a clearance.
72:47 The ball is delivered by Leigh Bromby, Andy Holdsworth manages to make a clearance.
71:27 Substitution Keigan Parker leaves the field to be replaced by Kieran Lee.
69:57 Patrick Kisnorbo takes the direct free kick.
69:57 Booking The referee shows Dean Furman a yellow card for unsporting behaviour.
69:50 Dean Furman challenges Neil Kilkenny unfairly and gives away a free kick.
68:29 Jermaine Beckford produces a right-footed shot from the edge of the box and misses to the right of the target.
66:08 Free kick awarded for a foul by Keigan Parker on Andy Hughes. Free kick taken by Casper Ankergren.
64:53 The ball is sent over by Keigan Parker, Casper Ankergren makes a save.
64:06 Dean Furman produces a left-footed shot from just outside the penalty box that goes wide left of the target.
62:59 Free kick awarded for a foul by Andy Hughes on Keigan Parker. Keigan Parker delivers the ball from the free kick right-footed
from right wing, Richard Naylor makes a clearance.
62:25 Andy Holdsworth delivers the ball, Patrick Kisnorbo makes a clearance.
60:11 Free kick awarded for a foul by Dean Furman on Bradley Johnson. Robert Snodgrass restarts play with the free kick.
59:04 Corner taken right-footed by Danny Whitaker from the left by-line, Alex Marrow gives away a free kick for an unfair challenge
on Michael Doyle. Free kick taken by Casper Ankergren.
58:50 Chris Taylor takes a shot. Save by Casper Ankergren.
56:33 Unfair challenge on Deane Smalley by Richard Naylor results in a free kick. Danny Whitaker crosses the ball from the free
kick right-footed from left wing, Richard Naylor fouled by Sean Gregan, the ref awards a free kick. Casper Ankergren takes
the free kick.
56:05 The ball is crossed by Robert Snodgrass, Reuben Hazell makes a clearance.
54:34 Chris Taylor takes a shot. Casper Ankergren makes a comfortable save.
53:41 Booking The referee shows Neil Kilkenny a yellow card for dissent.
52:58 The official flags Andy Hughes offside. Free kick taken by Darryl Flahavan.
48:15 Corner taken by Robert Snodgrass.
48:09 Bradley Johnson crosses the ball, blocked by Andy Holdsworth.
47:16 Keigan Parker concedes a free kick for a foul on Andy Hughes. Casper Ankergren restarts play with the free kick.
46:23 Foul by Dean Furman on Michael Doyle, free kick awarded. Patrick Kisnorbo takes the direct free kick.
45:50 Jonathan Howson takes a shot. Darryl Flahavan makes a save.
45:01 The second half has started.
45:00+1:53 The half-time whistle blows.
44:49 Unfair challenge on Neil Kilkenny by Reuben Hazell results in a free kick. Free kick crossed by Robert Snodgrass, save made
by Darryl Flahavan.
44:18 Free kick awarded for an unfair challenge on Leigh Bromby by Chris Taylor. Neil Kilkenny takes the free kick.
41:53 Deane Smalley gives away a free kick for an unfair challenge on Richard Naylor. Robert Snodgrass crosses the ball from the
free kick left-footed from right wing, Andy Holdsworth makes a clearance.
41:17 Deane Smalley challenges Patrick Kisnorbo unfairly and gives away a free kick. Free kick taken by Patrick Kisnorbo.
40:28 The ball is delivered by Lee Hills, Casper Ankergren makes a save.
39:00 Foul by Danny Whitaker on Andy Hughes, free kick awarded. Casper Ankergren takes the free kick.
36:34 Substitution Danny Whitaker is brought on as a substitute for Joe Colbeck.
35:03 Assist by Robert Snodgrass.
35:03 GOAL - Jonathan Howson:Oldham 0 - 1 Leeds United Goal scored by Jonathan Howson from outside the box to the top right corner of the goal. Oldham 0-1 Leeds.
33:44 The referee blows for offside against Chris Taylor. Casper Ankergren takes the indirect free kick.
33:31 A cross is delivered by Keigan Parker.
32:21 Free kick awarded for an unfair challenge on Chris Taylor by Bradley Johnson. Free kick crossed by Chris Taylor, save by Casper
30:45 Outswinging corner taken by Robert Snodgrass from the left by-line played to the near post, clearance by Alex Marrow.
30:34 Robert Snodgrass crosses the ball, clearance made by Deane Smalley.
30:06 Robert Snodgrass takes the outswinging corner, Joe Colbeck makes a clearance.
26:29 The assistant referee flags for offside against Keigan Parker. Richard Naylor takes the free kick.
24:59 Dean Furman concedes a free kick for a foul on Michael Doyle. Casper Ankergren takes the direct free kick.
24:28 Leigh Bromby crosses the ball, save by Darryl Flahavan.
22:04 Free kick taken by Darryl Flahavan.
22:04 Booking Jonathan Howson is shown a yellow card for unsporting behaviour.
21:55 Free kick awarded for a foul by Jonathan Howson on Chris Taylor.
18:38 Foul by Alex Marrow on Bradley Johnson, free kick awarded. Shot comes in from Bradley Johnson from the free kick. Michael
Doyle produces a left-footed shot from the edge of the area and misses to the left of the goal.
17:58 Free kick awarded for an unfair challenge on Neil Kilkenny by Keigan Parker. Free kick taken by Neil Kilkenny.
16:18 Jonathan Howson produces a cross, Andy Holdsworth makes a clearance.
12:55 Bradley Johnson takes a shot. Darryl Flahavan makes a save.
9:11 Chris Taylor crosses the ball.
7:05 Corner taken by Robert Snodgrass.
6:59 The ball is sent over by Bradley Johnson, blocked by Sean Gregan.
5:28 A cross is delivered by Bradley Johnson.
4:07 The ball is swung over by Lee Hills.
3:15 Keigan Parker produces a cross.
2:48 Foul by Michael Doyle on Deane Smalley, free kick awarded. Dean Furman takes the direct free kick.
2:37 Robert Snodgrass takes a shot. Blocked by Sean Gregan.
1:47 Free kick awarded for an unfair challenge on Robert Snodgrass by Reuben Hazell. Free kick taken by Robert Snodgrass.
0:25 Free kick awarded for an unfair challenge on Keigan Parker by Patrick Kisnorbo. Free kick crossed left-footed by Lee Hills
from right wing, clearance by Leigh Bromby.
0:00 The ref blows the whistle to begin the match.
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