It could have been more for the Millers as Stevenage posed no threat until the visitors eased off with the three points already in the bag.
Day kept his side in it as the Millers controlled the rest of the first half with the pick of his saves coming when he kept out Craig Morgan's header from O'Connor's free-kick.
However, his replacement Steve Arnold was at fault for Rotherham's second as he came flying out to meet Pringle's free-kick only to be beaten to it by Claude Davis.
And the excellent O'Connor put the result beyond doubt after 66 minutes when he fired home from 25 yards to round off a superb counter-attack.
- Sports & Recreation
- Ben Pringle
- Kieran Agard
- Alex Revell