Atletico have lost for their first away game in the Champions League as Porto scored two late goals to clinch all three points.
Substitution Mariano Nicolas Gonzalez Diego Valeri
Porto make their last change of the evening as Atletico attempt to push up and find a late goal to give them some confidence, but they lacked an edge that was required and changes should be made.
Substitution Radamel Falcao E. Farias
A cross flies in front of goal, but Aguero was not alert enough and cannot reach the ball and Porto are straight up to the other end.
The home fans are in celebratory mood because their team remained patient and waited for their chances and must now be favourites to take second place behind Chelsea.
Atletico are heading for yet another defeat and their run now extends to seven matches without a win in all competitions which will certainly lead to further doubts about Abel Resino's position as coach.
GOOOLLL!!! -This time the keeper could do nothing as Bruno Alves met the corner and nodded it against the post and Rolando was quickest to react and prodded home from close range.
Huuuyyy!!! - Falcao has suddenly come into the game and he could have had a second as he meets Hulk's cross at the far post, but he young keeper did well to save.
Substitution Jurado Reyes
Atletico are giving the ball away far too cheaply when they approach the Porto area, but they are then win it back because the hosts are just sitting back now.
Meireles set that goal up with a great cross-field ball for Hulk and the Brazilian then beat Perea and tested the keeper before squaring the rebound for the goal.
Goal Radamel Falcao
GOOOLLL!!! - Falcao has been quiet all game and suddenly comes up with a superb piece of skill as he flicks Hulk's cross that came along the six-yard line in with his in-step.
Huuuyyy!!! - Porto produced a flowing move that concluded with Mariano Gonzalez shooting from an angle and De Gea stood up to tip wide yet again.
Substitution Simão Maxi Rodríguez
Atletico make their first change of choice as Maxi enters the fray for Simao and the winger is booed and jeered as he goes off.
Huuuyyy!!! - Substitute Fredy Guarin has only been on a minute but he tried his luck from 25 yards with a great low drive that the keeper turned around the post.
Substitution Tomás Costa Fredy Guarín
Meireles was looking to go through and moments after sliding in and stopping Hulk, Pablo does the same against the full-back. Great defending.
Something needs to be done if there is to be a breakthrough and a change is set to be made by the hosts as they press up.
Huuuyyy!!! - Bruno Alves takes over free-kick duties and sees his drive from 40 yards out tipped over by the keeper.
Porto are now looking to regain their influence and Atletico are assuming the defensive role as Juanito trips Hulk and De Gea must organise his rearguard.
Tomas Costa takes aim and sends a shot over the bar that does deserve a huy! because it did not test De Gea at all.
Atletico are dominating possession now and rolling the ball around, but crucially they are being kept away from Helton's goal and could be susceptible to the break.
Porto have not begun the second half well and their defence is sitting back too deep and the forwards are again isolated and there is not much team play.
Cleber Santana deserves the whistles for trying an ambitious volley from 25 yards out that saw him connect badly and the ball spin near the corner flag and behind.
Huuuyyy!!! - From the corner Juanito met the ball firmly on his head six yards out, but he steered it over when he really should have scored. Best chance of the game.
Huuuyyy!!! - The whistles ring out as Ujfalusi sends a drive goalwards that Helton tips away, but Atletico played on as Rolando was down injured, but he is already back up.
Huuuyyy!!! - Hulk has another go as he sees a fierce drive fly just over from 20 yards shortly before the Brazilian is up-ended by Perea to earn the Colombian a yellow card.
Yellow Card L. Perea
Aguero thinks that he was fouled by Pereira and cannot believe that he has not been given a penalty.
Hulk is already looking busy again as he makes it to by-line on the right and his low cross is tempting, but nobody is there to meet it and test De Gea
The two teams are back out and Porto start the second period with no changes on either side.
The half time whistle sounds after a pacey opening 45 minutes that saw a lack of control and not many clear chances.
There will be two extra minutes of injury time and once more Simao receives the ball and again loses it without doing anything. He has not had a great half.
This time Meireles is offside and the fans do not agree with that, but he hit the ball against the post anyway.
There is a cheer as the ball hits the net but the linesman flag signals that Mariano Gonzalez was offside when Hulk played him in down the right.
Whether he has done well or not Hulk has been a key figure, but Falcao has done very little and his latest cross from insice the area was too high.
Atletico's defence are not being tested much by the front three of Porto as Hulk is isolated and handballs as he looks to control a long pass. As the home team they should commit more up front.
Hulk took the free-kick and there some whistles coming from the stands as the ball flew well over and the fans are tired of his efforts when a pass into the box maybe a better option on occasion.
Yellow Card Paulo Assunçao
Assunçao is booked after clipping Beluschi, who went down like he had been hit with a pole. No complaints from the Brazilian midfielder though.
De Gea has had nothing of note to do yet as he collects a long range effort from Fernando Beluschi and Atletico are actually gaining in confidence, if not in accuracy.
Hulk changed sides for a Porto corner and as he recovered it he looked back to cross and sent over an excellent centre that Bruno Alves was just able to redirect towards goal.
Forlan is playing in a deeper role and it is from there that he again picks up the ball and takes aim only for it to deflect behind. From the corner Pablo nods it on and past the far post.
Atletico have a corner after Simao was put through down the left and Fecile very well to slide in and blocked his shot. From the corner the ball is played out to Forlan on the edge and he swings at air. Off form the Uruguayan.
De Gea has his first touch as Porto see the ball go behind for a goal-kick and he will enjoy that rather than having to make a save early on. A true test of character for the youngster.
Substitution Roberto David de Gea
Both Leo Franco and Gregory Coupet left the club in the summer when Roberto returned from loan and Sergio Asenjo arrived from Real Valladolid. But Asenjo is at the Under-20 World Cup and so De Gea is coming on.
The keeper continues but only until Falcao's header loops up and forces Roberto to make a save and he then collapses inside the goal and signals to be changed.
Roberto requires treatment on a thigh pull after taking a goal kick and if he is injured then Atletico will have to look to 18-year-old David de Gea.
Hulk was caught in the face by Juanito and the huge Brazilian, who full name is Givanildo Vieira de Souza, took the set piece himself and sent the ball well over the bar from way out.
Huuuyyy!!! - Porto were caught napping at the back as Forlan's miscontrol then led to Tomas Costa not focussing and Aguero picked up the ball and took aim from outside the area but Helton was equal to it.
Forlan is embarrassed more than hurt after Aguero was caught in posession and he slipped trying to intercept the ball and as he rose Cleber was sent flying.
Hulk had a shot moments ago that flew well over and once again he is looking to test the Atletico defence as he powers past Luis Perea and sends in a low cross that is cleared by Pablo.
Hulk is not happy as Mariano Gonzalez only had to slide the ball down the wing for him to run onto and he pushed far too far ahead of the forward and off the pitch.
Huuuyyy!!! - Forlan has his first effort of the evening with a long ranger from the left flank and it was more of a practice effort for the keeper.
Raul Meireles was set up again in the area as Hulk broke down the right and cut the ball back, but the effort was blocked.
Huuuyyy!!! - Mariano Gonzalez pounces on a loose ball after Atletico fail to clear and he curls a shots just high and wide of the far post fro 20 yards out.
Tomas Ujfalusi will have a back ache and painful head in the morning after Roberto came to collect the ball from Hulk's cross and clattered through his own defender to reach it.
Simao Sabrosa took several minutes before having his first touch, but when he took it he received a round of jeers from the home fans thanks to his days with Benfica.
The home fans are not impressed as Porto kick the ball out, but the home team are enjoying more of the possession in these opening minutes.
Aguero muscles his way into the area, but his cut back is comfortably prevented from causing the keeper any problem and Porto can move forward again.
Hulk is already showing that he will be a handful just as he was for Atletico in this competition last when he helped Porto to an away goals win.
The visitors do kick off an immediately win a free-kick on the left flank as Sergio Aguero is fouled to give him a warning that he will be well-marked here.
There is a slight delay at kick off as the referee checks a player's socks, and it will be Atletico to start wearing their home shirts and red shorts.
The hosts are third in the Portuguese league and are looking to go at their guests from the off with a 4-3-3 formation that is headed by Falcao.
Porto knocked Atletico Madrid out of the Champions League last term, but Los Colchoneros' recent form means that avenging that maybe tough. Follow all the action live on Goal.com...