The Shrimpers are now three points clear of Swansea, who are not in action this weekend.
Phil Jevons' brace earned Yeovil a 2-0 win over Hartlepool, with him striking either side of the break.
Chesterfield beat Bradford 1-0 thanks to a late goal from Adam Smith, while Tranmere and Bournemouth played out a drab 0-0 draw at Prenton Park.