George Maris hit the winner to leave Stags in the last play-off place.
It was an important win for Stags with fellow promotion chasers Northampton, Bradford and Doncaster all winning.
Here is how the final League Two table will look, according to the supercomputer.
Give us your predictions on how the season will go via our social media channels. Would you take a play-off place if you were offered it now?
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Mansfield Town bet Rochdale 1-0 to bolster their promotion hopes. Photo: Chris Holloway
. Leyton Orient - 88pts (+29)
Promotion chance: 76% Photo: Pete Norton
. Northampton Town - 81pts (+23)
Promotion chances: 52%
Play-off chances: 34% Photo: Pete Norton
. Stevenage - 80pts (+14)
Promotion chances: 45%
Play-off chances: 36% Photo: Pete Norton
. Swindon Town - 77pts (+17)
Promotion chance: 40%
Play-off chance: 36% Photo: Chris Holloway
. Bradford City - 76pts (+18)
Promotion chances: 36%
Play-off chances: 37% Photo: Bruce Rollinson
. Salford City - 74pts (+17)
Promotion chances: 33%
Play-off chances: 36% Photo: Chris Holloway
. Mansfield Town - 72pts (+10)
Promotion chances: 25%
Play-off chances: 32% Photo: Chris Holloway
. Doncaster Rovers - 70pts (+7)
Promotion chances: 19%
Play-off chances: 29% Photo: AH Pix
1. Leyton Orient - 88pts (+29)
Promotion chance: 76% Photo: Pete Norton
2. Northampton Town - 81pts (+23)
Promotion chances: 52%
Play-off chances: 34% Photo: Pete Norton
3. Stevenage - 80pts (+14)
Promotion chances: 45%
Play-off chances: 36% Photo: Pete Norton
4. Swindon Town - 77pts (+17)
Promotion chance: 40%
Play-off chance: 36% Photo: Chris Holloway