Cameron McJannet struck a stoppage-time winner as Grimsby Town beat third-placed Cambridge United 2-1 to move into the League Two play-off places.
The promotion chasers looked set to share the points, only for McJannet to scramble the ball home four minutes into added time, inflicting only Cambridge's second home defeat of the season.
Mariners Make an Early Statement
Grimsby should have led early on when Justin Amaluzor played Kieran Green through, only for Cambridge goalkeeper Jake Eastwood to deny him.