Ben Hutchinson's early goal was enough for Mansfield Town to condemn struggling Southport to defeat.
Hutchinson fired the Stags in front when he turned home Nick Wright's ball into the box.
Shane Redmond was rarely threatened in the home goal, with Simon Grand heading wide the Sandgrounders' best chance.
Southport midfielder Andy Parry had to block shots from both Louis Briscoe and Jake Speight as the hosts eased to a comfortable victory.
VIEW FROM THE DRESSING ROOM
Mansfield Town manager Paul Cox told BBC Radio Nottingham:
"Overall I'm pleased with it. We're starting to look like a team now rather than a bunch of individuals.
"They've been our bogey side over the last couple of years and I thought we played well today.
"We kept our shape, we kept our discipline and more importantly we looked very hungry again."
Mansfield Town 23 Redmond 02 Sutton 04 Dempster 17 Beevers 33 Geohaghan Booked 07 Meikle 11 Briscoe 13 Howell 14 Clements Booked (Murray - 72' Booked ) 12 Wright (Speight - 66' ) 25 Hutchinson Substitutes 03 Thompson 21 Murray 08 Speight 10 Green 16 Rhead Southport 01 McMillan 02 Smith 03 Lever 05 Parry 06 Grand 17 Lynch 07 Whalley Booked 08 Ledsham (Stephenson - 78' ) 12 Benjamin (Almond - 65' ) 16 Moogan (Chalmers - 88' ) 18 Tames Substitutes 13 Hibbert 23 Willis 15 Chalmers 11 Almond 21 Stephenson