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Some ugly scenes at the end of the match as West Brom's former Sunderland winger James McClean celebrates his side's victory in front of the travelling supporters, leading to confrontations with some of the Sunderland players.
McClean is led away down the tunnel by team-mate Craig Gardner.Copyright: PA
Saido Berahino's second-half goal proves the difference as Sunderland are beaten in Sam Allardyce's first match as Black Cats manager.
All 11 players back for Albion as Sunderland's Adam Johnson puts a cross in from deep. Goalkeeper Boaz Myhill gathers easily.
Into stoppage time now, of which there will be three minutes.
Adam Johnson crosses from the left for Danny Graham but the Sunderland striker heads wide.
Time running out for the Black Cats.
Sunderland's Fabio Borini gets a booking for a foul on Craig Dawson.Copyright: Reuters
Hearts in mouths for Albion fans as Stephane Sessegnon goes to ground to make a challenge inside the box. Big penalty appeals by Sunderland, but the television replays suggest Sessegnon just got a touch to the ball.
At last, Sunderland force a save from West Brom goalkeeper Boaz Myhill in this second half.
Yann M'Vila breaks from midfield and puts in a shot from 25 yards, Myhill spills and it's cleared to safety by a Baggies defender.
Meanwhile, Albion goalscorer Saido Berahino is taken off to be replaced by Craig Gardner - another man facing his former club today.
Despite their lowly position in the table, it's interesting to note that West Brom have kept clean sheets in four of their eight previous Premier League outings this season.
This could be five in nine for Tony Pulis's men.
Sunderland's last substitution sees Danny Graham come on for Steven Fletcher up front.
Very much a front two now for Sunderland, with Jermain Defoe joining Steven Fletcher in attack. Looks like Danny Graham is being readied too.
At the other end, Saido Berahino's tame header is easily claimed by Costel Pantilimon.
Changes for both sides...
Rickie Lambert replaces Salomon Rondon for West Bromwich Albion.
For the visitors, Jermain Defoe is on for Jordi Gomez.
Sunderland manager Sam Allardyce is chewing gum furiously on the touchline.
His side have been denied a first Premier League clean sheet of the season, but there's still time for them to clinch at least a point from their trip to The Hawthorns.Copyright: Getty Images
Sunderland are struggling for ideas at the moment. A long hopeful ball aimed towards Steven Fletcher goes straight through to Albion keeper Boaz Myhill.
That goal seems to have brought Saido Berahino to life. He earns West Brom's first corner of the match but it comes to nothing.
Almost 2-0 West Brom. Chris Brunt's cross finds Salomon Rondon but he hooks wide of the post.
Sunderland manager Sam Allardyce makes his first change, with Seb Larsson replaced by Adam Johnson.
Former Aston Villa striker on Final Score
"I don't know why Costel Pantilimon is complaining because he lost control of the ball. He was trying to catch it over the head of Saido Berahino, who's about a foot shorter than him - you just want your goalkeeper to take everybody out there.
"Berahino did the right thing; put the ball in the back of the net and ask questions later."
That's the second time in two games that Sunderland goalkeeper Costel Pantilimon has made an error that's led to a goal.
He was at fault for Dimitri Payet's equaliser for West Ham two weeks ago, and despite his complaints to referee Martin Atkinson, Saido Berahino's opener here was allowed to stand.
Pantilimon was booked for his troubles.Copyright: Reuters
Saido Berahino gives West Brom the lead with his third Premier League goal of the season, and it's an error by Costel Pantilimon.
The big Sunderland goalkeeper Pantilimon couldn't claim Chris Brunt's left-wing cross under pressure from Berahino, and the ball drops onto the striker's arm before he pokes home from a yard.Copyright: PA
Plenty of attacking options on the West Brom bench, should Tony Pulis want to change things.
Rickie Lambert is warming up fairly vigorously on the touchline.
Appeals for handball against Sunderland defender Younes Kaboul inside the box, but Salomon Rondon's protests are waved away.
Meanwhile, Baggies midfielder Claudio Yacob is limping after a challenge by Lee Cattermole. And he's keen to tell referee Martin Atkinson about it.
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West Brom striker Saido Berahino touched the ball only nine times in the first half, the lowest number of any outfield player on the pitch.
It's been a quiet day so far for the Baggies' front man. Can the highly-rated youngster change things for his side in the second period?
Back under way. No changes to report by either side.
No goals at The Hawthorns, but plenty of others around the Premier League in the first half.
Follow BBC Sport's Saturday football live text commentary right here.
- Copyright: Opta
Here are some of the stats from the first half, which suggest West Brom have had the better of the play. However, they've yet to seriously test Costel Pantilimon in the Sunderland goal.
So far, so good for Sam Allardyce's Sunderland, who go into the break level.
They've created the best chance so far, with Billy Jones' close-range header tipped over by Boaz Myhill.Copyright: PA
Sunderland have edged the first half at The Hawthorns, but it's goalless at the interval.
West Brom's best move of the match so far, and again it's Stephane Sessegnon at the heart of it.
His right-wing cross is headed back across goal by James McClean, and Salomon Rondon can't get enough on his header to divert it on target.
Craig Dawson has to be a bit careful here. The West Brom right-back, booked in the first 10 minutes, clips the heel of Fabio Borini and leaves the Sunderland man down on the floor near the halfway line.
Referee Martin Atkinson doesn't offer any further punishment, but one more clumsy foul and Dawson might be seeing red.
Craig Dawson tries a speculative shot from 30 yards but the defender puts it miles over the bar. Sums up West Brom's first-half display, really.
West Brom, without a home win in the Premier League this season, are struggling to get going in this one.
It's fairly quiet inside The Hawthorns and the home fans need something to spark them into life.
James McClean can't provide it here - his cross sails way over Costel Pantilimon's crossbar.
- Copyright: Opta
This graphic shows the average position of Sunderland's players in the match so far.
As you can see, their two full-backs Billy Jones (number two) and DeAndre Yedlin (24) have been keen to get forward as much as possible.
West Brom captain Darren Fletcher fires in a snapshot from outside the area but the referee had already blown for handball.
The game's just quietened down a little after Sunderland's early burst of pressure.
That's better by West Brom. Ex-Sunderland winger James McClean barges his way past Seb Larsson near the byline and pokes a shot wide.
Stephane Sessegnon is showing why Tony Pulis included him in the West Brom line-up today.
The winger twists and turns before sending a left-footed shot just wide of the post from 18 yards.
Sunderland force another corner, their third, but it's wasted by Jordi Gomez. Straight over the heads of everyone in the box and out of play.
As bright as Sunderland have looked in the opening stages, they've been helped by some poor play by the home side.
Salomon Rondon is the latest West Brom man to play a sloppy pass out of play and gift their opponents the ball back.
Sam Allardyce will be delighted with the way his Sunderland side have started.
They've been on the front foot from the very start - only some solid West Brom defending and a fine save from Boaz Myhill has kept the scoreline goalless.
Sunderland are still to win in the Premier League this season, remember.Copyright: PA
Sunderland go close three times in the space of a few seconds.
Lee Cattermole's shot from the edge of the box is blocked, and then Steven Fletcher's follow-up is turned behind for a corner.
From that corner, Baggies keeper Boaz Myhill makes a flying save to tip over a diving header by Billy Jones.
West Brom full-back Craig Dawson goes into the book for a crunching challenge on Jordi Gomez, after he'd failed to control the ball and lost possession.
West Brom's first attack of note comes via Stephane Sessegnon, who breaks past two Sunderland defenders on the right, but his low cross is hooked away by Younes Kaboul.Copyright: Reuters
Some good early signs for the visitors, particularly down the right for Sunderland. Full-back DeAndre Yedlin is combining well with Sebastian Larsson so far and they've caused West Brom some problems in the opening five minutes.
An early excursion forward by Sunderland as Saido Berahino gives the ball away in midfield.
Fabio Borini's cross into West Brom's box is easily cleared for a throw.
Referee Martin Atkinson blows his whistle and West Brom get us under way.
The Baggies in their traditional blue and white stripes, Sunderland in their green change kit.Copyright: PA
Earlier, Liverpool drew 0-0 at Tottenham in Jurgen Klopp's first match in charge of the Reds.
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The two teams are making their way out onto the field at The Hawthorns, and understandably there are a huddle of photographers around the away dugout.
New Sunderland manager Sam Allardyce emerges in a long, black coat and shakes hands with a few of the home supporters.
Match of the Day commentator
"We all knew that it wouldn't be long before Sam Allardyce returned to the Premier League. The short-term survival mission facing the new Sunderland manager is one his three predecessors have managed, only to leave in the following campaign.
"If Allardyce can give Sunderland a first league win it will be a massive boost ahead of the crucial derby against Newcastle next weekend.
"West Bromwich Albion will fancy their chances of a first home league win of the season, particularly against a side who have yet to keep a clean sheet.
"All the attention will be on Big Sam. It may switch to Tony Pulis if the Baggies lose."
Sunderland came ever so close to ending their long wait for a Premier League victory two weeks ago, as they went 2-0 up at home to West Ham with goals from Steven Fletcher and Jeremain Lens.
But then things started to go wrong. Carl Jenkinson pulled a goal back for the Hammers, and Lens was sent off.Copyright: Reuters
A mistake by goalkeeper Costel Pantilimon allowed Dimitri Payet to equalise and the Black Cats had to settle for a 2-2 draw.
Within 24 hours, Dick Advocaat has resigned as Sunderland head coach.
West Bromwich Albion's excellent away record came to an end as they lost 2-0 at Crystal Palace.
Second-half goals from Yannick Bolasie and Yohan Cabaye inflicted a first away defeat of the season on the Baggies.Copyright: Reuters
Those two goals were also the first that Albion had conceded on their travels this term, and the result left them 17th in the table heading into the international break.
Sunderland's problems have been well documented, but West Bromwich Albion have hardly set the Premier League alight in the early weeks of the campaign either.
The Baggies are lie fourth from bottom, are the joint-lowest scorers in the top flight and have yet to win a league game at The Hawthorns this season.
Plenty for Tony Pulis to ponder, although three points against Sunderland could move his side as high as 11th in the table if other results go their way.Copyright: Getty Images
More from new Sunderland manager Sam Allardyce, who has 30 games to lead the Black Cats to Premier League safety.
"That was probably one of the reasons why I took the job," he said. "It gives me a bit of time to get things sorted out as quickly as I possibly can."
Want a good omen for today, Sunderland fans? Allardyce has won his first Premier League match in charge of his last four clubs - Bolton, Blackburn, Newcastle and West Ham.
Sam Allardyce is poised to return to a Premier League dugout for the first time since May.
The former West Ham manager, who turns 61 on Monday, replaced Dick Advocaat as Sunderland boss during the international break and takes charge of his struggling team for the first time at The Hawthorns.Copyright: Getty Images
"It's a big challenge," said Allardyce at his first news conference as Sunderland manager.
"Even at this early stage of the season, it's clear that we're in trouble.
"My job is to hopefully not to get into that panic and fear zone where there's only a few games left and if you don't win football matches you'll get relegated. I want to avoid that if I possibly can."
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The BBC Sport Predictor game pits fans of Premier League clubs against each other - and Sunderland supporters (ninth) are outperforming their West Brom counterparts (17th) in our table at the moment.
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"Like most other Premier League teams, Sunderland will have had a lot of players away on international duty so Sam Allardyce will not have been able to do too much work with them in his first week in charge.
"I think his methods will have an effect eventually, though, especially because I look at the Black Cats squad and think he has got at least a few of the kind of players that fit the DNA of his teams.
"Allardyce could well start with a defeat but, at the very least, he will be looking for industry and endeavour from his side on Saturday."
Prediction: West Bromwich Albion 2-0 Sunderland
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- Copyright: Opta
Sam Allardyce's first selection as Sunderland boss shows three changes from the 2-2 draw against West Ham two weeks ago.
Two of those changes are enforced, as midfielder Jeremain Lens and defender Sebastian Coates are both suspended.
Ola Toivonen also drops out, with Younes Kaboul, Jordi Gomez and Sebastian Larsson coming in.
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West Bromwich Albion make one change from their defeat at Crystal Palace last time out.
Stephane Sessegnon is brought into the starting line-up in place of James Morrison, who has an ankle problem, and comes up against his former club.
More on Sam Allardyce's appointment as Sunderland manager to come. First, let's catch up with the team news.Copyright: Reuters
Welcome to BBC Sport's dedicated live text coverage ofWest Bromwich Albion v Sunderlandat The Hawthorns.
It's 17th v 19th in the Premier League so the three points are important for both sides as they bid to move away from the wrong end of the table, even at this early stage of the season.
And we've got the added spice of a familiar face returning to the touchline...Copyright: Rex Features
Welcome to our live page for West Brom v Sunderland. We'll have text commentary here from 14:30 BST, plus you can follow Final Score via the live coverage tab. You can keep up to date with all the build-up to today's games here.