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You can read our match report here if you missed any of the game.
It has been an incredible start for Huddersfield and that draw means they are level on seven points with Manchester City at the top of the table.
Manchester United, who are on six points, host Leicester at 17:30 BST and could move ahead.
It's all over. Both teams remain unbeaten so far in their opening three Premier League matches.
Ryan Bertrand almost did!
Christopher Schindler makes a vital block on the line.
There's three minutes stoppage time to be played here at the John Smith's Stadium and it's still goalless.
Will either team grab a winner?
Final roll of the dice from David Wagner.
Collin Quaner comes on for Elias Kachunga for Huddersfield.
Shane Long almost pokes the ball into the back of the net but he arrives a fraction too late.
He was off-side anyway but Southampton are getting closer...
Nathan Redmond has the best chance of the second-half. Shane Long picks him out with plenty of space in the box but Redmond tries to place the ball past Jonas Lossl and it's an easy save for the Huddersfield keeper.
Five minutes of normal time left to play.
Well, it's all gone a bit flat after that first-half.
Huddersfield still look the most likely to score but neither team have shown much class.
James Ward-Prowse gets a breakthrough for Southampton but he goes to ground in the box looking for a penalty and it's not given.
Mauricio Pellegrino has made his final substitution for Southampton.
Sam McQueen is on and Dusan Tadic is off.
Huddersfield continue to press and it almost pays off as they force a mistake from the Saints' centre-back.
Jack Stephens is not happy with teammate Maya Yoshida after the defender spends too long on the ball and Stephens has to hastily kick the ball into the stands.
Shane Long's first involvement of the game is to foul Christopher Schindler.
The Southampton substitute almost escaped then. Will he be the man to turn things around for the visitors?
He's now been pushed further forward as Manolo Gabbiadini makes way for James Ward-Prowse. Mauricio Pellegrino is changing things up a bit here.
Huddersfield deal with those corners with ease and look to break away on the counter-attack but again, it comes to nothing.
Both teams need a goalscorer to step up.
Manolo Gabbiadini has barely been involved but he's managed to win a corner for Southampton. It's their first one of the second-half...
And they immediately win another.
Mauricio Pellegrino has already seen David Wagner make two changes and now he's hoping Shane Long will make an impact for Southampton.
They need inspiration from somewhere as this second-hand needs spicing up a little!
Philip Billing is off for Danny Williams, who signed from Reading this summer.
Match of the Day commentator at Stamford Bridge
It was a good first half but it's been lacking in quality for the first 15 minutes of the second.
That pretty much sums it up...
Rajiv van la Parra might still be feeling it after that tackle from Cedric Soares.
The Huddersfield midfielder is replaced by 20-year-old Kasey Palmer, who is on loan from Chelsea.
BBC Radio 5 live commentator
Huddersfield have been dominant, but so far unable to beat Fraser Forster in the Southampton goal.
Last season, in the Championship, if they had played this well - and created this many chances - they would surely be in front already. But this is the Premier League and David Wagner will know that his team has to do even better now in the second half, if they are to make it three straight wins in the top flight.
Southampton are still struggling to find their rhythm.
Steven Davis loses possession in midfield after some neat tracking back from Tom Ince.
Huddersfield then lose the ball themselves and Manolo Gabbiadini, who has barely been involved in this game, has the first shot on goal of the half for the Saints but it's easily saved by Jonas Lossl.
Cedric Soares catches Rajiv van la Parra, and the Huddersfield midfielder looks in some discomfort.
He should be OK to continue, though.
We're back under way at the John Smith's Stadium.
Here's proof of Huddersfield's domination in that first half...
Will we see this guy make his debut in the second half?
Wesley Hoedt, Southampton's latest summer addition, could become a regular feature at centre-back.
He's on the bench today, though.
As for Huddersfield, they have done everything BUT score.
Rajiv van La Parra has been a threat and Steve Mounie has had plenty of chances too.
Manager David Wagner will surely be asking for more of the same from his players.
Well Southampton have not had the most convincing start to the Premier League season but they have defended with resilience so far and everything Huddersfield have thrown at them, they have kept out.
Will they provide more of a threat in the second half?
Stephen Curley: Worth noting, Huddersfield were 100-1 to be top after match day 3. Nice each-way earner?
Huddersfield had eight shots on goal in that half but they just couldn't find the back of the net.
The Saints did everything they could to prevent Huddersfield from taking the lead and Mauricio Pellegrino will no doubt be relieved they aren't behind in this game.
Fraser Forster almost gifts a goal to Huddersfield following relentless pressure.
The Saints goalkeeper fumbles the ball into the path of at least two oncoming attackers but he gets away with it.
Southampton need half-time to come. Quickly.
Tom Ince is the next Huddersfield player to have a pot at goal.
His strike is saved well by Fraser Forster, who has to stretch low across his goal.
Huddersfield are all over the Saints, but when are they going to score?
Steve Mounie is looking for his third goal is as many league games - and he almost has it.
He beats Jack Stephens in the box following a cross from the right-hand side but his shot is miscued and dribbles just wide of Fraser Forster's right post.
Manolo Gabbiadini has had just three touches in this game so far. The Southampton striker hasn't had much service...
Jonas Lossl releases Elias Kachunga on the right wing with a terrific throw, after collecting Southampton's corner kick.
The winger drives forward with pace and plays in Rajiv van la Parra but the Huddersfield midfielder just can't convert it.
Huddersfield are on top here!
Rajiv van la Parra has made a great start to this game - and he's just put in a very dangerous ball which Elias Kachunga managed to get on the end of.
Fraser Forster was in the right place, though, and he made the save. The ball was still not cleared properly and Steve Mounie came in with an unsuccessful follow-up.
Former Spurs striker on Final Score
Huddersfield are controlling this game.
They are very relaxed, look confident and keeping the ball well. If they get three points out of this they are flying.
And just as I write that, Steven Davis has an opportunity to shoot at the other end.
Chris Lowe comes in with a very important block.
Southampton have got in behind the hosts' defence on two occasions now...
Huddersfield have a chance of their own, but Mathias Jorgensen's header is an easy save for Fraser Forster.
There hasn't been too much between the two sides so far.
Nathan Redmond almost opens the scoring for Southampton. He finds space on the left but drags his shot wide and that is a huge let-off for Huddersfield.
The Saints should be 1-0 up here...
All the action is in Southampton's half at the moment but Huddersfield haven't really caused any problems.
The home fans are making themselves heard though...
Huddersfield's corner comes to nothing but it's a bright start from the home side and Southampton have struggled to get hold of the ball so far.
Steve Mounie looks up for this game and he's already causing problems as he almost nicks the ball off Cedric Soares on the edge of the area.
Huddersfield have now got a corner thanks to a deflected shot from Rajiv van la Parra.