ATHENS: Manchester United’s dwindling hopes of lifting a trophy this season are dangling by a thread after they produced an abject display to lose 2-0 at Olympiakos Piraeus in a Champions League last-16 first leg on Tuesday.

Borussia Dortmund’s Robert Lewandowski scored twice in a clinical 4-2 win at Zenit St. Petersburg who were made to pay for some dreadful defending.

Olymiakos’ Alejandro Dominguez opened the scoring with a clever first half flick and Arsenal loanee Joel Campbell added a sublime second goal to leave United facing a huge task to overturn the deficit in the return match at Old Trafford on March 19.

“That’s the worst we’ve played in Europe. We didn’t deserve to get anything,” manager David Moyes told reporters. “I’m surprised, I didn’t see that level of performance coming.

“I take responsibility, we have to play better. The players are hurting.”

Defeat at the Georgios Karaiskakis Stadium represented yet another body blow in an inauspicious campaign for last season’s English Premier League title winners.

United are out of the FA Cup and the League Cup and trail Premier League leaders Chelsea by 15 points with 11 games left to play.

Moyes’s men looked sluggish and disjointed against an inexperienced Olympiakos side who are bidding to reach the quarter-finals for only the second time in their history.

It was the first time the Greeks had beaten United in five attempts.

“To beat a great side like United, the way we did, is something very special and I can’t hide the joy and pride I feel for my players,” said Olympiakos coach Michel.

“We picked the best moment to show Greek football is alive and kicking,” added the former Spain and Real Madrid striker.

Moyes opted to start with two wingers, Antonio Valencia and Ashley Young, but neither made an impact in a first half in which runaway the Greek league leaders displayed real energy and hunger.

After a cautious opening from both sides amid ear-splitting noise from an enthusiastic home crowd, the first chance fell to Olympiakos as Dominguez burst through the middle on a solo run only to be denied by a last-ditch tackle from Nemanja Vidic.

Midfielder Tom Cleverley registered United’s only effort of note in the first half with a 17th-minute half-volley that sailed high over the bar.

Strike pair Wayne Rooney and Robin van Persie were peripheral figures for the visitors as pot shots on goal from Giannis Maniatis and Hernan Perez lifted the home supporters.

Olympiakos, wearing bright red and white jerseys, red shorts and socks, broke the deadlock seven minutes before halftime with a smart piece of improvization from Argentine forward Dominguez.

Patrice Evra’s half-hearted clearance from a corner landed at the feet of Maniatis 25 meters out and his tame, low shot was expertly diverted past keeper David De Gea by Dominguez’s flick.

United, the European champions in 1968, 1999 and 2008, were punished again for poor defending 10 minutes into the second half.

Campbell, who is likely to feature for Costa Rica against Group D rivals England at the World Cup in Brazil in June, did the damage.

He picked up possession 25 meters out, jinked past midfielder Michael Carrick and sent a curling left-foot shot round defender Rio Ferdinand and into the bottom corner of the net.

Moyes sent on Danny Welbeck and Shinji Kagawa for Valencia and Cleverley but it was more a change in attitude than personnel that was required from United.

Dutch striker Van Persie summed up his team’s night with five minutes to go. He received the ball 12 meters out and turned inside a defender before blazing a right-foot shot way over the bar.

In Saint Petersburg, coach Jurgen Klopp said Borussia Dortmund had produced a near-perfect performance to leave them on the verge of the Champions League’s quarterfinals after routing Zenit St. Petersburg away on Tuesday.

Poland striker Robert Lewandowski scored twice as Dortmund romped to a 4-2 win at Zenit’s Petrovsky Stadium in the last 16, first-leg clash.

Klopp was delighted as Borussia bounced back from Saturday’s shock 3-0 defeat at relegation-threatened Hamburg in the Bundesliga to dominate Zenit.

Last season’s finalists raced into a 2-0 lead with goals by Henrikh Mkhitaryan and Marco Reus inside the first five minutes to leave the Russians reeling.

The hosts pulled two goals back after the break as central midfielder Oleg Shatov scored, then Brazil’s Hulk converted a penalty.

But on both occasions Dortmund responded almost immediately as Lewandowski scored twice toi give the German side a huge advantage ahead of the second leg next month.

“That was close to an optimal performance,” said Klopp.

“In terms of pressing and counter pressing, that was a copybook performance from us against a dangerous team.

“We were incredibly active and aggressive.

“It’s not easy to do that and the team put in a fantastic performance.

“We played against a very talented side, who showed the whole time that they wanted to play football.

“Even up to the end of the game, St. Petersburg didn’t resort to hitting long balls and always tried to find ways of getting behind us.

“Zenit were always dangerous whenever Hulk had the ball.”

But Klopp urged caution ahead of the return leg on March 19 by insisting nothing has been decided yet.

“Champions League has never been about blowing the final whistle after the first leg,” said the 46-year-old.

“Overall, this is a very nice night for us, but we are not yet in the quarterfinals.

“We have still a lot of hard work ahead of us in the second leg.”

Klopp was clearly delighted to see his team produce the perfect response after the Hamburg defeat had left Dortmund in third place but 20 points behind Bundesliga leaders Bayern.

“It was clear to me that my team would produce a reaction,” said Dortmund coach Jurgen Klopp.

“My team can never be accused of going about their business without showing some character.

“We didn’t give 100 percent against Hamburg and played too little football.

“We conceded goals at the wrong moments and didn’t get a result.

“Today we produced the correct reaction after conceding each goal.”