Wrexham secured a massive win in their bid to win promotion to League One as they beat their biggest rivals for automatic promotion on Good Friday.
After a quiet and scrappy start to the game, the contest burst into life when Mullin swept home Andy Cannon's low cross to the edge of the six-yard box in the 32nd minute. A raucous home crowd breathed a huge sigh of relief just after the hour mark when Davis Keillor-Dunn's equaliser was ruled out as it was deemed the former Wrexham player fouled goalkeeper Arthur Okonkwo in the build-up. Four minutes later, Mansfield's Jordan Bowery felled Luke Bolton in the box - although there was some doubt over whether he actually had entered the area - and Mullin smashed home his spot-kick to double the Welsh side's advantage.
Phil Parkinson's men saw out the remainder of the contest in impressive fashion as they drew level on 73 points with Mansfield and are just one point off leaders Stockport County.