Huddersfield kept alive their hopes of securing second spot in npower League One by defeating champions Brighton 3-2 at Withdean Stadium.
Danny Ward's last-gasp winner saw the Terriers keep the pressure on Southampton when the match looked as if it was heading for a draw.
Despite the Terriers' win, they remain in third position after Southampton thumped Brentford 3-0 at Griffin Park.
Adam Lallana netted the opener in the 16th minute, before a David Connolly chip doubled the Saints' advantage 14 minutes later. The visitors looked comfortable throughout and put the icing on the cake deep into stoppage time, with Oscar Gobern prodding home a third.
The Saints are now on 86 points, level with Huddersfield, although crucially have a game in hand on their rivals.
Elsewhere in the play-offs, Rochdale pegged back fourth-place Peterborough to secure a 2-2 draw. Jean-Louis Akpa Akpro netted in the first minute of the match for Dale, before goals by Nathaniel Mendez-Laing and Lee Tomlin swung the match in favour of Darren Ferguson's side. However, with three minutes remaining Craig Dawson found the back of the net to secure a share of the spoils.
Leyton Orient lost 3-0 at home to Tranmere thanks to Adam McGurk's brace and Aaron Cresswell's opener while James Dunne's first goal of the season gave Exeter a 1-0 victory against local rivals Plymouth to move onto 67 points but Bournemouth's 2-2 draw at Hartlepool secured Lee Bradbury's side a play-off berth with a game to spare.
Sam Baldock and Angelo Balanta helped fifth-placed MK Dons to a 2-1 win against Notts County, who netted through Lee Hughes while Sheffield Wednesday drew 1-1 at Bristol Rovers after Will Hoskins drew level from the spot after Tommy Miller's earlier penalty for the visitors.
Jon Nurse's double saw 10-man Dagenham and Redbridge boost their survival hopes with a 3-0 win against Carlisle and Yeovil defeated Colchester 4-2 at Huish Park. Craig Alcock, Andrew Tutte, Dean Bowditch and Andrew Welsh netted for the Glovers, while Ashley Vincent and David Mooney scored Colchester's consolation efforts.
Chris Taylor's brace helped Oldham to a 2-0 win at relegated Swindon, while William Grigg and Julian Gray netted in Walsall's 2-0 win over Charlton, a result which moves the Saddlers out of the relegation zone.
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