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Adama Sidibeh came off the bench to grab a late point for Stockport in a 1-1 draw at Notts County but it was not enough to reclaim top spot in League One.
The Magpies looked like they had held on for rare back-to-back league victories thanks to a stunning first-half strike from midfielder Scott Robertson.
Stockport's second half pressure eventually told when, with nine minutes remaining, Sidibeh was put through by fellow substitute Benony Andresson for the Gambia striker to slide the equaliser past keeper James Belshaw.
Huddersfield's 2-1 lunchtime victory against Wigan knocked Jimmy McNulty's side off the summit and last season's beaten play-off finalists were soon behind as Robertson scored for the first time since February.
Stockport failed to deal with Nick Tsaroulla's 11th-minute cross from the right and Conor Grant's touch teed-up former Celtic midfielder Robertson to find the top corner from 20 yards with an unstoppable left-foot effort.
The hosts were unable to add to their advantage and Sidibeh ensured Stockport's second-half pressure was rewarded as the 28-year-old claimed his first goal of the season in his second appearance since returning from a hamstring injury.