Aaron Wildig stunned Forest Green Rovers in the 85th minute as he struck a late winner to condemn Rovers to their first home defeat of the season.
Mark Cooper’s side dominated for large periods of the game, but failed to find the back of the net despite having 19 shots.
Morecambe move up to 19th in League Two following victory in Nailsworth, pushing further away from the bottom two.
Forest Green are now three points outside of the Playoff places and will be looking to bounce back against Oxford in the FA Cup tomorrow evening.
Rovers came into the game without injured duo Liam Shephard and Lee Collins, but welcomed back left-back Joseph Mills to the starting eleven. The Green Devils were hoping to end a run of three games without a win and Morecambe seemed like the perfect opponents to stop the rut.
Despite having surgery on a hernia problem, Zak Mills played through the pain barrier for the visitors, but the game came too soon for Shrimps trio Andy Fleming, Lamin Jagne and James Sinclair. Top goalscorer Rhys Oates also missed out for Morecambe, who elected to play with Vadaine Oliver as the sole striker, with Doncaster Rovers loanee Liam Mandeville playing in the number ten role.
The home side dominated from the first whistle and could have been ahead inside 30 seconds, however Carl Winchester blazed over.
Morecambe defender Steve Old was then on hand to save his side from going behind as he cleared George Williams’ effort off the line to keep the game goalless.
Mandeville could have given Bentley’s side the lead just before the break, but James Montgomery pulled off a point blank stop to ensure that the two sides went in level at the break.
The second half followed the same pattern as the first with FGR dominating proceedings in front of the home faithful.
Reece Brown and Reuben Reid went close for the hosts but a mixture of superb defending and great goalkeeping kept them at bay.
The game seemed to be heading for a draw, but Morecambe captain Aaron Wildig’s deflected effort secured an unlikely win for the side from Lancashire.