Millwall effectively secured Sky Bet Championship football next season after former Sunderland forward Duncan Watmore’s second-half strike at the Stadium of Light earned a 1-0 win.

In a game of few chances, Watmore, who had only been on the pitch four minutes, pounced to deliver the crucial goal that earned the Lions a third successive win.

Sunderland, however, saw their own winless run on home soil extended to six matches dating back to February 10.

The hosts threatened first and Millwall goalkeeper Matija Sarkic had to get down low to hold a drive from teenager Chris Rigg after he danced his way through the visiting defence.

Bradley Dack then created a couple of openings for Dan Ballard with some pinpoint deliveries but neither found the target.

Jobe Bellingham headed over another corner kick when he looked like he could at least test the Sarkic, but Millwall survived.

The Lions were struggling to create anything until former Sunderland midfielder George Honeyman’s set-piece was headed off target by Zian Flemming.

In a bid to improve things, Sunderland’s interim boss Mike Dodds pushed Bellingham up front for the second half as part of the changes brought about by replacing Dack with Trai Hume.

And Hume, operating at right wing-back, had the first effort after the restart when he drove a couple of feet over Sarkic’s bar from 22 yards.

In another attempt to lift the tempo by Dodds, Abdoullah Ba and Adil Aouchiche were brought on for the last half an hour.

Soon after that Sunderland thought they had the lead when Ryan Leonard somehow got in the way to block Callum Styles’ goalbound effort from Ba’s cross.

And in the 71st minute Millwall made the hosts pay when Ryan Longman’s low cross from the right was met by substitute Watmore, who had darted ahead of his markers to flick inside Anthony Patterson’s near post.

Bellingham almost deflected Brooke Norton-Cuffy’s cross into his own net in stoppage time but Millwall had already done enough to secure a vital three points.

Jamie Vardy’s 13th goal of the season proved unlucky for Sunderland as Leicester ended their losing streak to strengthen their Sky Bet Championship title hopes.

The 37-year-old’s first-half header was enough to secure a 1-0 win at the Stadium of Light, although it took a fine save by goalkeeper Mads Hermansen to deny Trai Hume a spectacular equaliser and condemn his team to a fifth successive defeat.

Enzo Maresca’s men would have been kicking themselves had they allowed two priceless points to slip from their grasp after squandering early chances, but they had to resist a stern examination as the hosts finished strongly.

The Italian’s response to Saturday’s 2-1 home defeat by QPR was to shuffle his pack with one of his four changes restoring Vardy to the starting line-up, while at the other end of the scale, Sunderland midfielder Chris Rigg was handed a first league start at the age of 16.

Leicester’s bandwagon had stalled somewhat after a run of three successive defeats, while Sunderland had lost their previous four and in the circumstances, a scrappy start to the game was perhaps not unexpected.

The Foxes were first to show when Stephy Mavididi cut inside from the left and raced away from Dan Ballard only for Luke O’Nien to get a vital touch on his cross, and it took an improbable double-save from Anthony Patterson to deny Vardy and then Yunus Akgun after Sunderland had been exposed down their right once again.

Patterson produced a fine reaction stop to keep out Wout Faes’ header from a 13th-minute Kiernan Dewsbury-Hall free-kick, but Vardy pounced to nod the rebound home.

The Black Cats started to work their way back into the game and Hermansen was sent sprawling to his left to claim Jobe Bellingham’s header from a 31st-minute O’Nien cross, but Patterson had to get down well to save Hamza Choudhury’s first-time strike as City pressed once again.

Sunderland returned after the break in determined mood with Dan Neil probing from midfield, but they were unable to pierce the blue wall which stood between them and Hermansen until Hume took aim from distance and saw the keeper tip his 64th-minute piledriver on to the crossbar.

Hume forced Hermansen into further saves with an 80th-minute attempt from distance and a stoppage time free-kick as the home side piled on the pressure, but the visitors, who sent on Wilfred Ndidi as a late substitute on his return from injury, held firm to see out an important win.

Southamtpon’s unbeaten start to the Championship season came crashing to an end as Russell Martin’s side were blown away 5-0 by brilliant Sunderland at the Stadium of Light.

Sunderland fans taunted Ross Stewart after the injured striker’s deadline-day switch to Saints as Tony Mowbray’s side built on a dream start and stunned the visitors.

Jack Clarke scored the opening goal after just 52 seconds before Pierre Ekwah added a deflected second six minutes later.

The outstanding Ekwah scored his second and Sunderland’s third on the stroke of half-time. Bradley Dack added a fourth early in the second half before 16-year-old substitute Chris Rigg rounded off a perfect afternoon with his first league goal in the fifth minute of stoppage time.

The win means Sunderland – who signed four players on deadline day, including Chelsea loanee Mason Burstow – are now unbeaten in three games.

In the week boss Mowbray marked his first anniversary as boss, the Black Cats delivered their best performance of his tenure so far.

A fine opening goal inside a minute set Sunderland on their way. Abdoullah Ba found Trai Hume on the right and the full-back delivered a teasing cross that was met by winger Clarke, who ghosted in at the back post to head home.

Ba was again involved in the second six minutes later. After a Jobe Bellingham cut-back, the winger, only in the team because of the injury to Patrick Roberts, who Southampton tried to sign this week, teed up Ekwah on the edge of the box and the former West Ham midfielder found the bottom corner from 25 yards.

After their nightmare start, Southampton settled down and tried to get a grip of the game. In a dominant 10 minute spell, Martin’s side had 91 per cent of possession but failed to find the goal they needed after the horror opening.

And rather than sit back and soak up pressure, Sunderland then pushed for more goals.

The third came in the 45th minute when Ekwah pounced on a mistake by Southampton debutant Mason Holgate and curled into the bottom corner from 25 yards out.

Southampton made two substitutions at the break, introducing Che Adams after his deadline-day move to Wolves fell through and Newcastle loanee Ryan Fraser. But the changes did not have the impact Martin had hoped for and within four minutes of the restart Sunderland had their fourth.

Gavin Bazuna saved well to keep out a header from Dack but the home side kept the ball alive and the former Blackburn man poked home from close range.

Sunderland put the icing on the cake in the 95th minute when Rigg headed in a cross from fellow substitute Jewison Bennette.

Chris Rigg became Sunderland’s youngest ever goal scorer but his efforts proved in vain as they crashed out the Carabao Cup with a 5-3 penalty shoot-out defeat at the hands of Crewe.

At the age of 16 years and 51 days, Rigg also became the youngest player to net in the competition’s history as his second-half strike cancelled out a first-half header from Crewe defender Luke Offord.

However, with the game finishing 1-1 at the end of 90 minutes, Pierre Ekwah’s penalty miss proved crucial as Crewe converted all five of their spot-kicks to book a place in the second round.

Crewe came within inches of breaking the deadlock in the 16th minute but, while Jack Powell’s direct free-kick curled around the Sunderland wall, the ball rebounded off the base of the right-hand post.

Alex Pritchard went close with a set-piece of his own, forcing a smart low save out of Harvey Davies, and also aimed two more long-range efforts straight at the Crewe goalkeeper.

Nathan Bishop was making his Sunderland debut at the other end following a summer move from Manchester United and the goalkeeper was beaten in first-half stoppage time.

A corner from the right-hand side passed all the way across the Sunderland goalmouth, enabling Offord to head home at the back post.

The Black Cats equalised midway through the second half, with the Crewe defence failing to adequately deal with a cross from substitute Jack Clarke. The ball fell at the feet of teenager Rigg, who fired home to claim his first senior goal.

Ekwah struck the post as Sunderland pushed for a winner, but Davies saved from Bradley Dack in stoppage time to send the game to penalties.