Manchester United [ Images ] winger Cristiano Ronaldo [ Images ] fluffed a second-minute penalty as his side drew 0-0 with a dominant Barcelona [ Images ] in the first leg of their Champions League [ Images ] semi-final at the Nou Camp on Wednesday.

Own goal denies Reds win 

The Portugal international, who has scored 38 goals in all competitions this season, sent his spot kick high and wide after Barca centre-back Gabriel Milito [ Images ] handled the ball in the area with just over a minute on the clock.

United appeared stunned and surrendered the initiative to Barca but although the Catalans dominated they failed to take advantage and visiting goalkeeper Edwin van der Sar [ Images ] was only seriously tested by substitute Thierry Henry [ Images ] late in the game.

Barca have been poor in the Primera Liga but gave a far more impressive performance against an out-of-sorts United and will feel short-changed by a result that leaves the tie delicately balanced before next week's return at Old Trafford.