Blair Sturrock and Grant Holt scored a goal each to give Rochdale a comfortable win over 10-man Mansfield.
Sturrock netted midway through the first half as he collected Scott Warner's flick-on before finishing right-footed from close range.
Mansfield's Jon Olav Hjelde was sent off for a foul on Alan Goodall before Holt fired home his eighth goal of the season to wrap up the victory.
After the game, Carlton Palmer resigned as Mansfield manager.
Rochdale: Gilks, Clarke, Griffiths (McArdle 90), Gallimore, Goodall, Brisco, Warner, Jones, Holt, Lambert (Jaszczun 79), Sturrock (Moyo-Modise 87).
Subs Not Used: Woodhall, Kitchen.
Goals: Sturrock 25, Holt 83.
Mansfield: Pressman, Day, Hjelde, Baptiste, Uhlenbeek, Coke, McLachlan (Birchall 37), Talbot (Rundle 37), Jelleyman, Barker, Brown, Rundle (Littlejohn 82).
Subs Not Used: Buxton, Lloyd.
Sent Off: Hjelde (66).
Ref: M Jones (Cheshire).