BRISTOL City remain five points clear in League One after a 3-1 win at Coventry City.
Marlon Pack and Keiran Agard put the Robins two up and after the Sky Blues pulled one back, Scott Wagstaff netted late on to maintain their unbeaten start under former Notts County boss Steve Cotterill.
Peterborough sit second as they saw off Barnsley 2-1 at home, who the Magpies travel to tomorrow night.
Conor Washington scored his fourth goal of the season for Posh in the win, with Marcus Maddison getting the other from a free-kick, but this was only after Devante Cole had put the visitors in front.
In terms of Shaun Derry's men, who now sit sixth, they are just two points off third-placed Swindon, who drew 1-1 at Yeovil.
Preston, Sheffield United and Fleetwood Town all climbed up the standings, like the Magpies did, after wins against Port Vale, Bradford and Doncaster respectively.
League One results: Chesterfield 1 Oldham 1, Coventry 1 Bristol City, Fleetwood 3 Doncaster 1, Leyton Orient 0 MK Dons 1, Notts County 5 Crawley 3, Peterborough 2 Barnsley 1, Preston 2 Port Vale 0, Rochdale 1-1 Gillingham 1, Scunthorpe 1 Colchester 1, Walsall 0 Crewe 1, Yeovil 1 Swindon 1, Bradford 0 Sheff Utd 2