Efforts from the hosts courtesy of German, Nadesan and Lubala condemned Latics to another defeat away from home after what was a promising start to the encounter.
Latics started the brighter in West Sussex after Head Coach Dino Maamria named an unchanged starting line-up from last weekend but it would be the hosts who would provide the reverse scoreline to the same fixture last season.
In the opening stages Smith’s fierce effort glanced past Morris’ post before Dearnley missed a great chance from yards out in the penalty area after Nepomunceno silky footwork put the Crawley defender down on the floor.
As Oldham continued to create chances and look confident on the ball, Borthwick-Jackson had a half chance from distance with the outside of his left boot.
Then in the 23rd minute the Crawley keeper, who was in fine form and is set to win their player of the year award again, was called into action as he pulled off a fantastic double save, the first being with his face as Dearnley forged out the efforts from a tight angle.
But not taking the chances meant Crawley started to create and would ultimately take the lead.
Lubala missed when it was easier to score a minute later from Dearnley’s opportunity but it was ten minutes later when the Red Devils went one up.
Replacing the injured Ollie Palmer, Ricardo German scored on his first league start for the hosts, neatly cutting back inside and placing into the goal after his striker partner Nadesan did extremely well to find him in space to run onto.
Things went from bad to worse when Wheater was substituted due to injury shortly after conceding and meant Hamer was placed alongside Piergianni with N’Guessan brought on at right-back.
Crawley finished the stronger in the first-half and could’ve doubled their lead with two half chances from close range again as German and Lubala especially continued to cause problems on the left.
In the second-half it was the Red Devils that dominated proceedings as Oldham failed to continue how they started the afternoon in terms of creating chances and staying solid at the back.
The Reds got the Broadfield Stadium on their feet with waves of attacks. The first being on the 55th minute when Nadesan had time to run onto goal again with his shot being blocked by De la Paz after a final heavy touch in the area.
Pressure from John Yems’ men increased as they scored their second on the 69th minute. Nadesan involved again calmly chipping it over De la Paz into the goal with ease as a fast break started the attack.
Five minutes later and the third came from the penalty spot. Lubala sent the goalkeeper the wrong way after winning the appeal as Sylla brought down the winger.
As changes were made by both sides it was Crawley who continued their unbeaten and clean sheet run, as Latics failed to score for the first time in nine games and means Oldham are still searching for that first win away from home since Boxing Day.
Attendance 2,037 (186 Away)
Crawley Town: Morris (GK), Doherty, Nadesan, Feguson (54’ Powell), German (61’ Allarakhia), Francomb ©, Sesay (82’ Camara), Tunicliffe, Snedles-white, Cogley, Lubala.
Oldham Athletic: De la Paz (GK), Nepomuceno, Sylla, McCann, Smith, Wheater © (39’ N’Guessan), Piergianni, Hamer, Dearnley (64’ Maouche), Rowe, Borthwick-Jackson (78’ Branger-Engone).
Referee: Charles Breakspear