Lionel Messi's Barcelona gave an emphatic response to the doubters when they made Champions League history by overturning a 2-0 first-leg deficit to oust seven-times European Cup winners AC Milan today.

Messi's superb double set Barca on their way in the first half at a raucous but desperately tense Nou Camp and David Villa and Jordi Alba struck after the break to send the La Liga side through to the quarter-finals 4-2 on aggregate.

They became the first team in Europe's elite club competition to ever overturn a two-goal first-leg deficit without the benefit of an away goal and are one of only five sides to fight back from more than one goal down.

"We will remember this for years to come," Barca sporting director Andoni Zubizarreta told Spanish television.

"Messi's two goals put us in a strong position, Villa's was very important and Alba gave everyone exactly what they wanted with the fourth," added the former Barca and Spain goalkeeper.

There was talk of the end of an era after a poor run of form saw Barca eliminated from the King's Cup and beaten in La Liga by arch rivals Real Madrid following the reverse to Milan at the San Siro last month.

Barca's dream of a third European crown in five years appeared to be in tatters and the pressure increased when Jose Mourinho's Real marched past Manchester United into the quarter-finals last week.

Doubts dispelled

Messi, Champions League top scorer the past four seasons, was accused of failing to perform on the big occasions but proved today against Milan that it was folly to question his form.

The Argentina forward and four-times World Player of the Year conjured the fifth-minute opening goal with a sweet curling strike with barely any back lift as a cluster of Milan players attempted to close him down.

His second came five minutes before halftime when he received the ball from Andres Iniesta on the edge of the area, created space for himself and lashed the ball past Milan goalkeeper Christian Abbiati.

It was his 58th Champions League goal, putting him two clear of former Manchester United and Real Madrid striker Ruud van Nistelrooy in second place on the scoring chart behind Raul, another former Real forward, who leads on 71.

He has scored 40 goals in La Liga this season to help Barca move 13 points clear at the top and has 53 in 42 appearances in all competitions, including seven in the Champions League.

Team effort

For all Messi's brilliance, today's match should be remembered as a superb team effort.

Playmakers Xavi and Andres Iniesta provided creative spark, Sergio Busquets was immense in central midfield and Alba and fellow fullback Daniel Alves gave Barca the width and penetration they lacked in the first leg.

Assistant Barca coach Jordi Roura, standing in for Tito Vilanova while he has cancer treatment in New York, will also be delighted that his decision to deploy Villa up front alongside Messi and Pedro paid off so handsomely.

Although he saw relatively little of the ball, the Spain striker was a handful for Milan centre backs Philippe Mexes and Cristian Zapata, helping create space for Messi to exploit, and his goal was beautifully taken.

The 31-year-old has struggled for form since returning from a broken leg sustained at the end of 2011 but responded with a finish that suggested he may be getting back to his best.

"It's a tremendous joy," Villa told reporters. "We should enjoy this and right now I don't care about our opponents in the quarter-finals."

"When you have days like this you forget all about the bad ones. I prefer to think about today. It is something we deserved and now we have to think about the future."

The draw for the last eight will be made on Saturday (NZT), with Real, Juventus, Paris St Germain, Borussia Dortmund and Galatasaray already through along with Barca.

-TVNZ

Messi, Barcelona and the great Champions League comeback

Hailed as perhaps football’s greatest team ever, Barcelona faced a challenge no club had overcome: advancing in the Champions League after trailing by two goals without having scored an away goal.
Lionel Messi & Co. came through in spectacular fashion with another record-setting night.
The 4-0 victory against AC Milan in the round of 16 before a screaming crowd of 94,944 at Camp Nou on Tuesday saw them become only became the fifth side in UEFA Champions League history to win a knockout tie after losing the first leg by two goals or more.
In the final second-round matches Wednesday, Arsenal tries to overturn a 3-1 deficit at Bayern Munich and Porto goes to Malaga with a 1-0 lead. If Arsenal is eliminated, England won’t have a team in the last eight for the first time since the 1995-96 season.
We take a look at some of the greatest Champions League comebacks — matches that may offer hope and inspiration to the Gunners:
1999/2000 quarter-finals
First leg: Chelsea FC 3-1 FC Barcelona
Second leg: FC Barcelona 5-1 Chelsea FC (aet)
This was the pre-Roman Abramovich era, Gianluca Vialli was coach and Chelsea’s 3-1 win over Louis van Gaal’s Barcelona was a surprise. Gianfranco Zola and Tore André Flo, who scored two goals, secured the win in the first leg. But Barcelona produced the perfect game to win the second leg 5-1 in extra time. Rivaldo’s penalty and a Patrick Kluivert goal promptly killed the Blues off in extra time.
2003/04 quarter-finals
First leg: AC Milan 4-1 RC Deportivo La Coruña
Second leg: RC Deportivo La Coruña 4-0 AC Milan
Kaka’s two goals inspired Milan to an easy 4-1 win in the first leg but Deportivo held on to their slim chance with a tenacity that was unbelievable. Back in Spain for the second leg, Deportivo were a changed side: Pandiani, Juan Carlos Valerón and Alberto Luque made it 3-0 at the break, and substitute Fran González added with a fourth goal on 76 minutes to complete a famous win. Milan didn’t know what hit them.
2003/04 quarter-finals
First leg: Real Madrid CF 4-2 AS Monaco FC
Second leg: AS Monaco FC 3-1 Real Madrid CF
Madrid cruised in the first leg. A 4-2 victory is often a big enough advantage for a top team like Madrid. But try telling that to Didier Deschamps and his team. When he was asked whether he thought the tie was lost after the first leg, the Monaco coach saying: “If I thought that, I’d be better off staying home.” And his team responded in kind. Ludovic Giuly levelled after Madrid went up early in the second leg, Morientes – on loan from Madrid – headed a second and Giuly made it 3-1.
2011/12 round of 16
First leg: SSC Napoli 3-1 Chelsea FC
Second leg: Chelsea FC 4-1 SSC Napoli (aet)
Chelsea were a team in shambles. The players didn’t like the manager André Villas-Boas and AVB didn’t like them either. After the 3-1 defeat in the first leg, AVB was sacked and Roberto Di Matteo stepped in to fill the breach but he did more than just step in. He somehow managed to work a miracle.
Goals from Didier Drogba, John Terry and Frank Lampard helped take the contest into extra time and Branislav Ivanović secured victory after 105 minutes. This just might have been the moment that told them there were more miracles awaiting ahead.

-Firstpost