Stags laboured in a first half dominated by a decent-looking Vale side and short on chances.
But Spurs loanee youngster Oliver Irow came on at half-time and provided the spark needed with a brace of goals and a sensational 45 minutes display as Mansfield went up a gear and won comfortably in the end.
Here are our player ratings from the game...
1. LIAM ROBERTS 9
Another magnificent display and a huge factor in the win. Assured handling and command of his area and just before the break he made a crucial save when Dajaune Brown went through one on one with him. Photo: Chris Holloway
2. STEPHEN McLAUGHLIN 7
Another steady display at left wing back from the veteran, getting his tackles in and providing a threat going forward. His pass sent Irow on his way for his second. Photo: Pic : Chris & Jeanette Holloway
3. RYAN SWEENEY 8
Commanding captain's display at the back. After a shaky start to the season, now looking more like the player Stags had in his first spell at the club. Photo: Chris Holloway
4. BAILY CARGILL 7
Assured display in the heart of defence and played a full part in the Stags not conceding in a tough first half. Took a booking and then sacrificed at half-time to let Stags go to a back four and try a different way to break down Vale. Photo: Chris Holloway