Mansfiewld Town’ FA Cup dream was ended in this FA Cup second round replay as Cambridge earned a third round home with Luton Town.
Kakai’s early deflected 20-yard speculative effort gave the visitors the lead and they created the better chances in an open tie.
Sascha Studer saved the Stags on several occasions, notably just before half-time from Appiah, although Reggie Lambe nearly found an equaliser midway through the second half, but his effort went wide.
Rakih Bingham was also close to a late leveller, before an offside flag robbed them of am injury time leveller in a last-gasp rally that left new manager Adam Murray still looking for his first win since taking charge.