Kike, Adomah & Stuani score with headers
Leaders Boro three points clear
Brighton's unbeaten league start ended
Brighton 0-2 Middlesbrough
What a first 45 minutes for Middlesbrough - kicked off in empahatic fashion by Kike.
Image source, Rex FeaturesAnd just before the break - Albert Adomah made things even better.
Looks like Brighton's unbeaten run could go before Christmas.
Quote MessageMiddlesbrough have had two chances and scored twice. Brighton have had more possession in the half.
Warren Aspinall, Former Brighton striker on BBC Sussex
Brighton 0-2 Middlesbrough
Jason Roberts
Ex-West Brom striker on BBC Radio 5 live
Image source, Rex FeaturesQuote MessageAwful defending from the set-play. Nobody is even close to Ayala. Adomah directs it towards the goal and there are four or five goals for you each season if you stand in front of the goalkeeper.
Brighton 0-2 Middlesbrough
Second goal for Middlesbrough and right on the stroke of half-time.
Corner from the right comes off Daniel Ayala first before a couple of touches off Brighton heads and Albert Adomah finishes it off with a flick-on.
Big task ahead of Brighton now.
A quiet afternoon so far for Dimi Konstantopoulos.
Not had a shot to save as his back four do more sterling work in front of him.
Image source, Rex FeaturesMore superb patience shown by Middlesbrough in defence.
They're letting Brighton get a bit flustered in and around the edge of the penalty area before waiting for a chance to clear.
No way through for the hosts so far.
Gordon Greer and Kike jump together in an aerial challenge and Kike comes off the worse from it.
The Boro striker wants some punishment for Brighton's defender but again Craig Pawson has no interest.
Brighton 0-1 Middlesbrough
Jason Roberts
Ex-West Brom striker on BBC Radio 5 live
Quote MessageGreat wing play by Van La Parra. Friend's not diverted his run, he's just running straight to his defensive position. There was a collision but it was no fault of anyone. In reality, it wasn't a penalty.
Rajiv van La Parra makes some ground into the Middlesbrough area down the right and clashes with George Friend before going to ground.
Referee Craig Pawson says no penalty.
Image source, Rex FeaturesMore composed stuff here from Aitor Karanka's side as his old dugout pal Jose Mourinho watches on from the stands.
Switching it well left and right as Brighton continue to chase red shirts.
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Dale Stephens takes a shot from distance for Brighton which flashes wide of the target.
Worth a go, but Brighton again having to wait for an opening as Middlesbrough keep a firm shape.
A snapshot of an earlier chance for Brighton's James Wilson which was dealt with by Middlesbrough.
Image source, PANot many clear cut chances so far for the unbeaten Seagulls.
Image source, Getty ImagesBrighton still showing a lack of composure on the ball as they try to rush it out of defence.
Long ball forward goes aimlessly out of touch.
Brighton 0-1 Middlesbrough
Jason Roberts
Ex-West Brom striker on BBC Radio 5 live
Quote MessageWilson did a really good job of making some space, but credit to Ayala. He didn't dive in. Middlesbrough's defensive shape and individual decision-making is fantastic.
Better from the hosts as James Wilson gets a chance to run at the Boro back four.
He shifts it wide of Daniel Ayala but can't direct the shot on target.
Poor so far from Brighton.
They try a quick free-kick on the left side, which is first blocked by the Boro wall before Beram Kayal tries a shot from distance which is almost over the South Downs and out to sea.
These are the views of our BBC local radio summarisers on the opening 20 minutes...
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Oh dear. Brighton's Jamie Murphy won't want to see that again.
He's attempted to clear it with a boot over the top and has only succeeded in kicking it straight at his face!
A hush around the Amex as Middlesbrough continue to show patience on the ball.
Brighton having to stand off here as they seek a way back into the game.