The Iron's 2-0 win over Port Vale and Brentford's 1-0 success over MK Dons leaves both sides on 17 points - two clear of Huddersfield, who won at Oldham.
The performance of the weekend came from Swansea - who hammered Bristol City 7-1 - despite not opening the scoring until first-half stoppage time.
Winger Kevin McLeod hit a hat-trick, with striker Lee Trundle grabbing a brace and Leon Britton also scoring.
Colchester beat Doncaster 3-2, a result which leaves Rovers at the bottom of the table. Two own goals in as many minutes sealed the Yorkshire side's fate.
They replace Yeovil Town, who pulled themselves out of the relegation zone thanks to a 2-1 win over Walsall at Huish Park.
Phil Jevons and Kevin Gall scored the goals that saw them come back to win
after Matty Fryatt had put the Saddlers ahead.
Hartlepool hit two late goals to beat Blackpool 2-1 at Bloomfield Road, despite trailing with just four minutes to go.
Swindon fans called for boss Andy King's head after his side lost 2-1 at home to Southend.
Tranmere and Bradford drew 2-2 on Friday night, a result which does neither side's play-off hopes much good.
Bradford twice held the lead but the Wirral side were good value for their point after sustained pressure in the second period.
Chris Greenacre hit the leveller 18 minutes from time, with Delroy Facey also on the scoresheet for Rovers.
Richard Edghill and David Wetherall netted for the Bantams.