Doncaster Rovers 2 Mansfield Town 3: Managerless Rovers knocked out of the FA Cup by League Two Stags
In their first game since dismissing Richie Wellens as manager, Rovers got off to a strong start when Horton slotted in to give them the lead after seven minutes.
Mansfield equalised in the 48th minute when a corner was flicked on by Lapslie and Forrester nodded in at the back post.
The goal gave the visitors a significant lift and they went ahead on the hour when Lapslie finished well from a tight angle.
Mansfield had their tails up and went further ahead after 70 minutes when Lapslie capped off a sweeping team move with a fine finish.
Tommy Rowe drilled in from 20 yards after a well-worked free kick routine with six minutes remaining to put some doubt on the outcome, but Mansfield held on.