They set up the glamour trip after a superb 4-3 win at Sheffield United in the last round.
Stags were joined in the draw by fellow giant-killers Macclesfield, who knocked holders Crystal Palace out in one of biggest FA Cup shocks of all time, and Wrexham, who knocked out Forest.
So who will be grabbing the giant-killing headlines in the next round. Here a supercomputer – produced by BettingLounge – predicts the outcome of the rest of this season’s FA Cup ties.
How does the FA Supercomputer work?
The FA Cup Supercomputer via BettingLounge simulates the fourth round of the FA Cup 10,000 times. Once the simulations have been made, the remainder of the tournament is simulated 10,000 times so we can see how likely all teams are to get to different stages of the competition and the most frequent outcomes.
The fourth-round results show the most frequent scores from all fixtures. The Supercomputer was conducted after the fourth-round of the draw was made on Monday night.
