Oldham booked their place in the next round by beating Thurrock.
A second half Chris Killen penalty was enough to save Oldham a shock FA Cup exit at the hands of Conference South outfit Thurrock.The former Manchester City hit-man struck early in the second period after on-loan wide man Lee Croft was felled by a stray Thurrock leg.
Brian Talbot's League Two strugglers travelled to Ship Lane shorn of eight first-team regulars and many sensed an upset in the amateurs' tight ground.
However, the game proved a dour affair, with Oldham's Croft producing the finest moment of the first period when he saw his controlled volley palmed over by Billy McManoh.
Killen dispatched his penalty three minutes after the break and save for the occasional forays of striker Cliff Akurang, Thurrock never really looked like delivering a leveller.
McManoh had to be at his sharpest to deny Oldham skipper Dean Holden and then veteran David Eyres drilled wide after earning a yard of space with an adroit dummy.
Sunday's other FA Cup clash went the way of form in an all League Two affair, as Swansea booked their place in the next round by beating Cheltenham 3-1.
Kenny Jackett's promotion seekers went two goals ahead through Kristian O'Leary and Lee Trundle, with Cheltenham's consolation coming from Damian Spencer.
Paul Connor added gloss to a polished Swansea performance with a third in the final minute.
