London, February 25:

Defending champions Manchester United’s first-half dominance failed to produce any goals on Tuesday at Inter Milan in a 0-0 draw in the first leg of the Champions League’s last 16.

Barcelona and Atletico Madrid were also held to draws as Europe’s premier club competition resumed after a two-month break. Thierry Henry’s header salvaged Barca a 1-1 draw at Lyon, and Atletico twice threw away their lead and allowed FC Porto to claim a valuable 2-2 draw. Arsenal was the only victorious side, beating AS Roma 1-0 on Robin van Persie’s 37th-minute penalty.

Manchester United completed a record 20th consecutive Champions League match unbeaten, but squandered a string of chances at the San Siro in the first half. Cristiano Ronaldo had come close in the fifth with a header that was blocked by Julio Cesar, and the Portugal winger threatened with a couple of free kicks.

Lyon captain Juninho put the French side ahead in the seventh minute, scooping the ball over the head of Barcelona goalkeeper Victor Valdes. The former Brazil midfielder’s 42nd goal from a free kick wasn’t enough to separate the French and Spanish league leaders. Thierry Henry leveled for Barcelona in the 67th when Rafael Marquez flicked on Lionel Messi’s corner from the right.

Arsenal wasted chances for a far bigger margin of victory as they edged Roma 1-0. Van Persie scored from the spot in the 37th after he had been tripped by Roma defender Philippe

Mexes. Nicklas Bendtner squandered two chances and Emmanuel Eboue was wasteful, while John Arne Riise almost equalised for Roma.

Lisandro Lopez scored both goals as FC Porto twice came from behind to draw at Atletico Madrid. Pablo Ibanez misjudged a long ball in the 22nd minute and Lisandro ran in behind the Atletico defender to shoot under Leo Franco. The Argentine scored another in the 72nd.

Maxi Rodriguez gave Atletico the lead in the third minute, and Diego Forlan scored Atletico’s second in first-half injury time when Porto goalkeeper Helton let the Uruguay striker’s shot slip through his hands.

The second legs of Tuesday’s matches will be held on March 11.