Yeovil's lead at the top of League Two is down to three points after they lost at Darlington.
The Glovers went down 2-1 at The Williamson Motors Stadium as Darlington continued their push for a play-off spot.
Former Ajax and Leeds star Clyde Wijnhard gave The Quakers the lead after 13 minutes.
The home side doubled their lead on the hour with Alun Armstrong (pictured) finding the back of the net.
Darren Way gave Yeovil some hope with his goal nine minutes from time, but even Wijnhard's dismissal a few minutes later could not inspire Gary Johnson's side.
Scunthorpe took advantage of Yeovil's slip-up as they cruised to a 4-1 win over Cheltenham at Glanford Park.
Matt Sparrow grabbed two goals either side of the interval (44 & 55) which sandwiched a leveller from Jamie Victory.
The Iron left it late to confirm victory, but they did so in emphatic fashion as Richard Kell (85) and Cliff Byrne (90) struck.
Macclesfield Town moved into the top three after a 1-0 win at Shrewsbury with John Miles grabbing the winner ten minutes from time.
The Silkmen moved above Southend, after they were held to a 1-1 draw by Lincoln at Roots Hall.
Ben Futcher looked to have given The Red Imps victory when he scored on 87 minutes, but Fredy Eastwood's late penalty made sure the home side took a share of the spoils.
Swansea remain in fifth after sharing four goals and two red cards with Rochdale at The Vetch Field.
Grant Holt fired Dale ahead on 31 minutes, before Lee Trundle and Paul Tait both saw red within a minute of each other for bad fouls.
Within a minute of the restart Andy Gurney levelled for Swansea and soon after Holt put through his own net to give the home side the lead.
The Swans looked destined for victory until the final minute when Rickie Lambert struck.
Northampton dropped out of the play-offs after losing their local derby with Rushden & Diamonds 3-2.
Rushden went ahead after just seven minutes through Peter Hawkins, but Northampton found themselves in front thanks to goals from Martin Smith (45) and debutant Andy Kirk (52).
Drewe Broughton restored parity on the hour with a penalty, before Billy Sharp grabbed the winner on the stroke of full time.
The win means Rushden keep their four-point gap from the bottom two, while also closing to within two points of Chester who are above them.
That is because Chester went down 4-2 at Wycombe - who are now on the edge of a play-off spot and are only seventh on goal difference.
Michael Branch had put Chester ahead, but Wycombe soon took control of affairs.
Nathan Tyson fired a brace (43 & 52) before Gus Uhlenbeek and Roger Johnson scored just before the hour.
Branch grabbed a second from the penalty spot two minutes from time, but that was a mere consolation.
The 1-1 draw in the Lincolnshire derby at York Street did neither Boston nor Grimsby much good.
Both sides continue to harbour hopes of a play-off spot, but neither could earn a crucial three points.
Boston got off to a flying start when Daryl Clare pounced against his former club in the first minute.
On-loan star Matt Harrold levelled on 69 minutes to give Grimsby a point.
Bottom-of-the table Cambridge are now eight points adrift, despite sealing a 1-1 draw at Leyton Orient.
Matt Lockwood opened the scoring (72), but Tes Bramble soon levelled on his debut for The U's.
Second from bottom Kidderminster are still four points off safety but their 3-1 win at Notts County will really bolster their morale.
Dean Keates fired home twice from the spot (76 & 86) and County keeper Saul Deeney saw red for the second incident.
Mark Stallard pulled one back (88) for the home side, but Chris Beardsley restored the two-goal margin on the stroke of full time.
Oxford banished any fears they could yet get dragged into relegation trouble thanks to a 3-1 win at Mansfield.
Steve Basham (7) opened the scoring before a brace from Chris Hackett (33 & 52).
Colin Larkin (90 pen) added a late consolation for Mansfield.
Bury avoided defeat thanks to a late equaliser against Bristol Rovers at Gigg Lane.
Craig Disley (30) had put The Pirates ahead, but Simon Whaley (78) gave The Shakers a point.
Click below for match summaries:
Boston 1-1 Grimsby
Bury 1-1 Bristol Rovers
Darlington 2-1 Yeovil
Leyton Orient 1-1 Cambridge
Mansfield 1-3 Oxford
Notts County 1-3 Kidderminster
Rushden & Diamonds 3-2 Northampton
Scunthorpe 3-1 Cheltenham
Shrewsbury 0-1 Macclesfield
Southend 1-1 Lincoln
Swansea 2-2 Rochdale
Wycombe 4-2 Chester

A look at the best pictures as Michael Owen completes a surprise move to Manchester United.
Pictures from the unveiling of Real Madrid's reported £56 million signing at the Santiago Bernabeu.
Pictures from the Under 21 championship semi-final between England and Sweden in Gothenburg.
Pictures from England's draw with Germany in the last Group B game of the Under 21 Championships.
A look at the best pictures as Michael Owen completes a surprise move to Manchester United.
| Time | Fixture |
|---|---|
| Friday 10th July | |
| Friendly Match | |
| 19:45 | Great Wakering vs Southend |
| Tuesday 14th July | |
| Friendly Match | |
| 18:00 | Canvey Island vs Southend |
| Saturday 18th July | |
| Friendly Match | |
| 15:00 | Chelmsford vs Southend |
| Wednesday 22nd July | |
| Friendly Match | |
| 19:45 | Southend vs Ipswich |
| Saturday 25th July | |
| Friendly Match | |
| 15:00 | Dag & Red vs Southend |
| Tuesday 28th July | |
| Friendly Match | |
| 19:45 | Barnet vs Southend |
| Friday 31st July | |
| Friendly Match | |
| 19:45 | Stevenage vs Southend |
| Saturday 8th August | |
| Coca-Cola Football League One | |
| 15:00 | Southend vs Huddersfield |
| Tuesday 11th August | |
| Carling Cup | |
| 19:45 | Cheltenham vs Southend |
| Saturday 15th August | |
| Coca-Cola Football League One | |
| 15:00 | Walsall vs Southend |
| Tuesday 18th August | |
| Coca-Cola Football League One | |
| 19:45 | Wycombe vs Southend |
| Friday 21st August | |
| Coca-Cola Football League One | |
| 19:45 | Southend vs Millwall |
| Saturday 29th August | |
| Coca-Cola Football League One | |
| 15:00 | Swindon vs Southend |
| Friday 4th September | |
| Coca-Cola Football League One | |
| 19:45 | Southend vs Leyton Orient |
| Friday 11th September | |
| Coca-Cola Football League One | |
| 19:45 | Southend vs Leeds |
| Saturday 19th September | |
| Coca-Cola Football League One | |
| 15:00 | Brighton vs Southend |
| Saturday 26th September | |
| Coca-Cola Football League One | |
| 15:00 | Southend vs Oldham |
| Tuesday 29th September | |
| Coca-Cola Football League One | |
| 19:45 | Brentford vs Southend |
| Saturday 3rd October | |
| Coca-Cola Football League One | |
| 15:00 | Stockport vs Southend |
| Friday 9th October | |
| Coca-Cola Football League One | |
| 19:45 | Southend vs Southampton |
| Time | Result |
|---|---|
| Saturday 2nd May | |
| Coca-Cola Football League One | |
| Southend 2 - 0 Cheltenham | |
| Saturday 25th April | |
| Coca-Cola Football League One | |
| Oldham 1 - 1 Southend | |
| Saturday 18th April | |
| Coca-Cola Football League One | |
| Southend 0 - 2 Leicester | |
| Monday 13th April | |
| Coca-Cola Football League One | |
| Northampton 2 - 3 Southend | |
| Friday 10th April | |
| Coca-Cola Football League One | |
| Southend 0 - 2 Milton Keynes Dons | |
| Saturday 4th April | |
| Coca-Cola Football League One | |
| Huddersfield 0 - 1 Southend | |
| Friday 27th March | |
| Coca-Cola Football League One | |
| Southend 3 - 2 Hartlepool | |
| Saturday 21st March | |
| Coca-Cola Football League One | |
| Southend 3 - 0 Carlisle | |
| Tuesday 17th March | |
| Coca-Cola Football League One | |
| Swindon 3 - 0 Southend | |
| Saturday 14th March | |
| Coca-Cola Football League One | |
| Hereford 0 - 1 Southend | |
| Tuesday 10th March | |
| Coca-Cola Football League One | |
| Brighton 1 - 3 Southend | |
| Saturday 7th March | |
| Coca-Cola Football League One | |
| Southend 2 - 0 Walsall | |
| Tuesday 3rd March | |
| Coca-Cola Football League One | |
| Southend 0 - 1 Millwall | |
| Saturday 28th February | |
| Coca-Cola Football League One | |
| Peterborough 1 - 2 Southend | |
| Tuesday 24th February | |
| Coca-Cola Football League One | |
| Southend 2 - 0 Scunthorpe | |
| Saturday 21st February | |
| Coca-Cola Football League One | |
| Colchester 0 - 1 Southend | |
| Tuesday 17th February | |
| Coca-Cola Football League One | |
| Southend 0 - 1 Crewe | |
| Saturday 14th February | |
| Coca-Cola Football League One | |
| Southend 2 - 1 Tranmere | |
| Saturday 31st January | |
| Coca-Cola Football League One | |
| Southend 1 - 0 Bristol Rovers | |
| Tuesday 27th January | |
| Coca-Cola Football League One | |
| Leeds 2 - 0 Southend | |
| Pos | Team | P | Pts |
|---|---|---|---|
| 15 | Norwich City | 0 | 0 |
| 16 | Oldham Athletic | 0 | 0 |
| 17 | Southend United | 0 | 0 |
| 18 | Stockport County | 0 | 0 |
| 19 | Swindon Town | 0 | 0 |
Huddersfield have completed the signing of striker Theo Robinson from Watford for an undisclosed fee.
American goalkeeper Ian Joyce has agreed to sign a new one-year contract with Southend United.
Steve Tilson admits he faces a dilemma regarding where to play Franck Moussa next season.
Southend United have lost out on their attempt to bring loan star Theo Robinson back on a permanent basis.
The League One season starts on 8th August and a number of mouth-watering ties have been cast into the mix.