Super sub Will Hoskins was the star of the show as Rotherham completed a classic smash and grab act at the JJB Stadium.
The young striker made a dramatic appearance on the hour with Rotherham seemingly content for a share of the spoils, but he stunned the home fans with a superb two-goal blast to extend Rotherham's unbeaten run to an impressive eight games.
For much of the game however it was a different story as Wigan had the upper hand against a Rotherham outfit seemingly content to soak up the pressure and hit the home side on the break.
Rotherham didn't have an effort on goal until after the hour and when manager Ronnie Moore replaced strikers Martin Butler and Darren Byfield with Shaun Barker and Hoskins it seemed a draw was what Rotherham were satisfied with.
But Hoskins had other ideas and in the 81st minute he slotted home a low drive from the six-yard box after picking up a through ball from John Mullin and two minutes later he struck again with a cracking drive from the edge of the area as the Wigan defence backed off.
Nathan Ellington pulled a goal back in injury time but it was too little too late and Wigan were left to reflect on the opening half when they pressured an overworked Rotherham defence, but saw keeper Mike Pollitt make three outstanding saves.