West Brom won for the first time in five matches to send Blackburn to their third defeat in a row and deeper into relegation trouble.
Martin Olsson turned into his own net after West Brom's Gareth McAuley had headed Chris Brunt's ball across goal.
A superb double-save by Ben Foster kept the scores level before Marc-Antoine Fortune drilled home at the far post.
Liam Ridgewell headed in Graham Dorrans's free-kick before Blackburn's Anthony Modeste was sent off late on.
Blackburn manager Steve Kean had said he was confident his side could repeat last season's win at The Hawthorns, but Rovers crumbled under pressure from set-pieces and lost three in a row for the third time this season.
They came up against a West Brom side that boss Roy Hodgson described as "desperate" for a victory to show they were not "winding down for the summer". That attitude showed from the first minute.
The hosts started with urgency and allowed Blackburn no space, attacking quickly down the flanks once in possession, with the full-backs pushing on.
Striker Fortune, recalled to the side at the expense of Shane Long, was the focal point. He held the ball up superbly, with Peter Odemwingie scampering off him with pace and Dorrans and Brunt finding space on the flanks.
Blackburn have picked up just one win and six points from the 20 matches in which they conceded the opening goal this season. It is the joint worst record in the division.
The pressure produced four corners inside seven minutes, from the last of which McAuley headed across goal and saw the ball turned into his own net by Olsson.
Albion continued to press and their best effort came when Odemwingie was just inches from poking home right-back Billy Jones's low cross at the back post.
Kean moved Junior Hoilett from the left wing to partner Yakubu up front for the second half and there was immediate improvement.
Hoilett cleverly laid the ball back to his new strike partner in space inside the penalty area. The Nigerian's shot was palmed away by Ben Foster but fell to Bradley Orr six yards out. He seemed certain to score but Foster produced another fine save.
The visitors were then undone by defensive mistakes, characteristic of a team who have conceded the second most goals in the league.
Yakubu carelessly gave the ball away on the corner of his area to Brunt, who curled an in-swinging cross to the back post, where Fortune was unmarked to score.
Ridgewell easily headed home Dorran's inswinging free-kick before Blackburn's day went from bad to worse as Modeste, on-loan from Bordeaux, senselessly kicked out at Jones in reaction to a tame challenge and was sent off.
West Brom head coach Roy Hodgson:
"Three-nil makes it seem more comfortable than it actually was. All credit to Blackburn. I thought they did well and will feel aggrieved not to get something from the game.
"We needed some good defensive work and a fantastic save which would have put them on level terms.
"[On being 11 points clear of relegation] I think we can relax to be honest, but hopefully we don't and keep rewarding our fans with wins and let's see how high we can finish in the table."
Blackburn manager Steve Kean:
"We were poor in the first half but came out more positive in the second half. The big point was the double save. I felt if we had scored that, with the momentum and possession, the score would have been very different.
"It is a very fine line. I've looked at the stats and we had 11 goal attempts and seven or eight on target. The goalkeeper has had a good day.
"We have a massive game against Liverpool now on Tuesday."
West Bromwich Albion
- 01 Foster
- 03 Olsson
- 06 Ridgewell
- 23 McAuley
- 28 Jones Booked
- 08 Andrews
- 11 Brunt (Cox - 82' )
- 17 Dorrans (Scharner - 87' )
- 21 Mulumbu
- 24 Odemwingie
- 32 Fortune (Long - 90' )
- 19 Daniels
- 20 Shorey
- 25 Dawson
- 05 Tchoyi
- 33 Scharner
- 09 Long
- 31 Cox
- 01 Robinson
- 03 Mn Olsson
- 16 Dann Booked
- 18 Orr
- 31 Hanley
- 08 Dunn
- 12 Pedersen (Modeste - 78' Dismissed )
- 15 Nzonzi
- 35 Lowe (Formica - 78' )
- 23 Hoilett
- 24 Yakubu
- 34 Kean
- 05 Givet
- 10 Formica
- 14 Petrovic
- 21 Ms Olsson
- 09 Modeste
- 25 Goodwillie
Live Text Commentary
Full Time The referee ends the match.90:00 +3:03
Simon Cox takes a shot. Save by Paul Robinson.90:00 +2:23
Peter Odemwingie crosses the ball.90:00 +0:11 Substitution
Substitution Shane Long comes on in place of Marc-Antoine Fortune.88:58 Booking
Booking Booking for Billy Jones.88:54 Dismissal
Dismissal Anthony Modeste is sent off.86:47 Substitution
Substitution Graham Dorrans goes off and Paul Scharner comes on.85:36
The ball is crossed by Mauro Formica, Jonas Olsson manages to make a clearance.85:26
The ball is sent over by Bradley Orr, clearance by Jonas Olsson.84:13
Assist on the goal came from Graham Dorrans.84:13 Goal scored
Goal! - Liam Ridgewell - West Brom 3 - 0 Blackburn Liam Ridgewell scores a headed goal from deep inside the penalty area. West Brom 3-0 Blackburn.83:07
Unfair challenge on Marc-Antoine Fortune by Bradley Orr results in a free kick. Graham Dorrans produces a cross,82:16
Scott Dann gives away a free kick for an unfair challenge on Jonas Olsson. Ben Foster takes the direct free kick.81:05
Free kick taken by Paul Robinson.81:05 Substitution
Substitution Chris Brunt goes off and Simon Cox comes on.81:05
The assistant referee signals for offside against Peter Odemwingie.77:20
Paul Robinson restarts play with the free kick.77:20 Substitution
Substitution Morten Gamst Pedersen leaves the field to be replaced by Anthony Modeste.77:20 Substitution
Substitution Mauro Formica is brought on as a substitute for Jason Lowe.77:20
The assistant referee signals for offside against Peter Odemwingie.
David Hoilett takes a shot. Save made by Ben Foster.75:31
Marc-Antoine Fortune challenges David Dunn unfairly and gives away a free kick. Free kick crossed by Morten Gamst Pedersen, Keith Andrews manages to make a clearance.73:50
The offside flag is raised against David Hoilett. Jonas Olsson takes the indirect free kick.73:33
Liam Ridgewell takes a shot. Scott Dann gets a block in.72:41
The ball is delivered by Youssouf Mulumbu, clearance by Scott Dann. Corner taken left-footed by Chris Brunt to the near post, Morten Gamst Pedersen makes a clearance.72:27
The ball is sent over by Morten Gamst Pedersen, clearance by Gareth McAuley.69:20
The referee blows for offside. Ben Foster takes the free kick.68:08
Assist by Chris Brunt.68:08 Goal scored
Goal! - Marc-Antoine Fortune - West Brom 2 - 0 Blackburn Goal scored by Marc-Antoine Fortune from close in to the bottom left corner of the goal. West Brom 2-0 Blackburn.67:09
The ball is swung over by Gareth McAuley, clearance made by Scott Dann. Graham Dorrans takes the inswinging corner, clearance made by Martin Olsson.66:11
Chris Brunt delivers the ball.65:39
Corner from the right by-line taken by Chris Brunt, clearance made by Scott Dann.63:56
David Hoilett takes a shot. Ben Foster makes a save.59:15
David Hoilett crosses the ball, Effort on goal by Jason Lowe from just inside the penalty box goes harmlessly over the target.58:49
Foul by Jason Lowe on Liam Ridgewell, free kick awarded. Free kick taken by Jonas Olsson.58:17
David Dunn takes a shot. Jonas Olsson gets a block in.56:38
Effort on goal by Ayegbeni Yakubu from just outside the area goes harmlessly over the target.55:51
Effort on goal by Jason Lowe from outside the box goes harmlessly over the bar.55:40
David Dunn takes a shot. Blocked by Jonas Olsson.55:09
Unfair challenge on David Dunn by Chris Brunt results in a free kick. Paul Robinson restarts play with the free kick.53:58
Ayegbeni Yakubu takes a shot. Blocked by Ben Foster. Bradley Orr takes a shot. Ben Foster gets a block in.52:27
The ball is crossed by Billy Jones, clearance by Grant Hanley.51:21
David Dunn gives away a free kick for an unfair challenge on Marc-Antoine Fortune. Keith Andrews takes the free kick.50:24
Graham Dorrans crosses the ball in from the free kick, clearance made by David Dunn.50:24 Booking
Booking Scott Dann is shown a yellow card for unsporting behaviour.50:18
Unfair challenge on Peter Odemwingie by Scott Dann results in a free kick.48:18
The ball is sent over by Chris Brunt, Paul Robinson makes a save.46:34
The assistant referee signals for offside against Peter Odemwingie. Free kick taken by Paul Robinson.45:50
The ball is sent over by Bradley Orr, Morten Gamst Pedersen takes a shot. Save by Ben Foster.45:01
The referee gets the second half underway.45:00 +3:12 Half time
Half Time The match has reached half-time.45:00 +1:21
The referee blows for offside against Peter Odemwingie. Paul Robinson restarts play with the free kick.45:00 +0:21
The ball is sent over by Billy Jones.44:09
David Dunn takes a shot. Save by Ben Foster.42:42
David Hoilett has an effort at goal from the edge of the box that misses to the right of the target.41:57
Youssouf Mulumbu takes a shot. Paul Robinson makes a save.41:23
David Dunn fouled by Graham Dorrans, the ref awards a free kick. Steven Nzonzi takes the direct free kick.40:32
Billy Jones crosses the ball.37:36
Free kick awarded for a foul by Jason Lowe on Youssouf Mulumbu. Direct free kick taken by Graham Dorrans.37:08
The ball is sent over by Billy Jones, clearance by Steven Nzonzi.35:11
Outswinging corner taken by Morten Gamst Pedersen, clearance by Jonas Olsson.33:35
Bradley Orr delivers the ball, Scott Dann takes a shot. Save by Ben Foster.32:41
Corner taken left-footed by Morten Gamst Pedersen from the left by-line, save made by Ben Foster.31:59
Keith Andrews delivers the ball, clearance by Bradley Orr.31:23
Morten Gamst Pedersen takes the inswinging corner, save made by Ben Foster.30:34
Youssouf Mulumbu challenges David Hoilett unfairly and gives away a free kick. Morten Gamst Pedersen crosses the ball from the free kick left-footed from right channel, clearance by Jonas Olsson.27:44
Foul by Steven Nzonzi on Jonas Olsson, free kick awarded. Free kick taken by Ben Foster.26:43
The official flags Peter Odemwingie offside. Paul Robinson restarts play with the free kick.26:00
Peter Odemwingie takes a shot from just outside the penalty area which clears the crossbar.23:41
A cross is delivered by Martin Olsson, Bradley Orr has a header from close in and clears the crossbar.21:45
The referee blows for offside against Marc-Antoine Fortune. Indirect free kick taken by Paul Robinson.19:39
The assistant referee signals for offside against Billy Jones. Paul Robinson takes the indirect free kick.19:31
The ball is delivered by Liam Ridgewell.19:20
A cross is delivered by Chris Brunt.18:07
The referee blows for offside against Steven Nzonzi. Free kick taken by Jonas Olsson.14:16
Graham Dorrans takes the inswinging corner, clearance by Grant Hanley.13:25
Ayegbeni Yakubu is adjudged to have handled the ball. Ben Foster takes the free kick.11:37
Steven Nzonzi takes a shot. Youssouf Mulumbu gets a block in. Outswinging corner taken by Morten Gamst Pedersen from the left by-line, Graham Dorrans makes a clearance.11:02
The official flags Marc-Antoine Fortune offside. Free kick taken by Paul Robinson.6:40
The assist for the goal came from Gareth McAuley.6:40 Goal scored
Goal! - Martin Olsson - West Brom 1 - 0 Blackburn Martin Olsson concedes an unfortunate own goal. West Brom 1-0 Blackburn.6:17
Inswinging corner taken from the right by-line by Chris Brunt, Gareth McAuley takes a shot.6:13
Billy Jones delivers the ball, Martin Olsson makes a clearance.5:36
Shot on goal by Martin Olsson from just inside the area goes over the target.4:48
Ayegbeni Yakubu fouled by Youssouf Mulumbu, the ref awards a free kick. Free kick taken by Paul Robinson.4:19
Corner taken left-footed by Chris Brunt from the right by-line, Grant Hanley manages to make a clearance.3:56
The ball is sent over by Chris Brunt, clearance by Martin Olsson.3:49
Billy Jones sends in a cross.2:48
Peter Odemwingie takes a shot from 25 yards. Blocked by Jason Lowe. Inswinging corner taken by Chris Brunt, Morten Gamst Pedersen makes a clearance.1:32
Inswinging corner taken from the right by-line by Chris Brunt, Jonas Olsson has a headed effort at goal from just inside the box that misses to the right of the goal.0:00
The match gets underway.
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