Peterborough kept their 100-per-cent record intact to go top with a 4-1 victory over Northampton, who by contrast have now lost their opening four games.
Gwion Edwards and Junior Morias scored for Peterborough in the first half and Jack Marriott added a third with 15 minutes remaining.
Alex Revell pulled one back but Marcus Maddison ended any thoughts of a comeback when he converted a stoppage-time penalty.
Like Northampton, Oldham are still searching for their first point of the campaign after slipping to a 2-1 defeat at Blackpool.
The Latics have now lost four league games out of four after Newcastle loanee Sean Longstaff put Blackpool ahead after just six minutes and Kyle Vassell doubled their advantage nine minutes later.
Aaron Amadi-Holloway pulled one back in the second half for Oldham but they could not find an equaliser.
Fleetwood’s winning start to the season came to a halt with a 3-1 defeat at Bristol Rovers.
Stuart Sinclair and Billy Bodin gave Rovers a commanding half-time lead, and although Devante Cole pulled one back on the hour mark, Ellis Harrison made the points safe.
Shrewsbury also dropped points for the first time this season with a 1-1 draw at Oxford.
Stefan Payne equalised after Gino van Kessel had given Oxford the lead.
AFC Wimbledon picked up their first league win of the season with a 2-0 victory over Doncaster.
Ghana international Kwesi Appiah gave Wimbledon a 58th-minute league and Andy Barcham added another two minutes later.
A Paddy Madden brace helped Scunthorpe to a 4-0 win over Plymouth, who had Antoni Sarcevic sent off on the stroke of half-time.
Tom Hopper grabbed a late third for the Iron and Josh Morris rubbed further salt in the wound in stoppage time.
Pre-season title favourites Blackburn cruised to a 4-1 victory against MK Dons.
Derrick Williams’ second-minute opener was cancelled out by Ed Upson, but a Charlie Mulgrew brace and Dominic Samuel’s late strike sealed the points for Rovers.
Patrick Bauer and Josh Magennis were on target as Charlton overcame Rotherham 2-0 at the New York Stadium, while Rochdale and Bury played out a goalless draw.
A Tom Eaves hat-trick helped Gillingham secure a 3-3 draw against Southend and Amadou Bakayoko grabbed a late equaliser for Walsall as they held Bradford to the same scoreline.