Lisbon - Manchester United were indebted to a superb Ryan Giggs goal as they drew 1-1 with Benfica on Wednesday despite a below-par performance in their Champions League Group C opener.
Giggs, 37, sent a rocket into the top corner three minutes before half-time to cancel out Oscar Cardozo's 24th-minute opener for a Benfica side who seemed intent on puncturing their opponents' early-season momentum.
At Lisbon's iconic Estadio da Luz, United looked a shadow of the side that have soared to the top of the Premier League with 18 goals in their first four games.
It was only thanks to Giggs and some fine goalkeeping from competition debutant Anders Lindegaard that Sir Alex Ferguson's decision to rest a string of players did not backfire.
In all Ferguson made eight changes to the side that beat Bolton 5-0 on Saturday, in a nod to Sunday's visit of Chelsea.
Patrice Evra, Jonny Evans and Wayne Rooney were the only men to keep their places.
Mindful, perhaps, of United's pedigree, Benfica were initially content to concede the initiative but uncertainty in the visitors' play allowed Jorge Jesus' men to assert themselves.
Cardozo registered Benfica's first shot on target with a low effort that Lindegaard claimed comfortably but the Paraguayan was less merciful in the 24th minute.
Collecting a high pass from the enterprising Nicolas Gaitan on his chest, he turned Evans adroitly before clipping an accomplished finish inside Lindegaard's right-hand post.
It was the first away goal United had conceded in the competition since their quarter-final loss to Bayern Munich in the 2009-10 tournament.
United's only effort of note had been a shot from a tight angle that Antonio Valencia blazed over the bar, but from nowhere Giggs rolled back the years to produce a stunning equaliser that silenced the home fans.
After picking up possession on the right-hand side, the Welshman spied a pocket of space on the edge of the box that he surged into before arrowing a fine drive into the top-right corner.
Giggs' goal, from United's first shot on target, broke his own record for the tournament's oldest goalscorer and means he has now scored in more Champions League campaigns - 16 - than any player in history.
His intervention could not disguise United's problems, however, and Benfica continued to look dangerous in the second half.
Pablo Aimar fizzed a low effort narrowly wide and although Giggs drew a save from Artur after wriggling into the area, Lindegaard then had to produce a brilliant stop to palm away a side-footed effort from substitute Nolito.
When Emerson advanced from left-back and toed a shot across goal, Ferguson decided he had seen enough and sent on Nani and Javier Hernandez in place of Darren Fletcher and Valencia.
There was no stemming the red Benfica tide though and after Lindegaard had pushed away a curler from Gaitan, Phil Jones was sent on to add muscle to the creaking away defence.
A late let-off for United saw Nolito find the side netting from close range with three minutes left and Ferguson will ultimately have been thankful that his side's most challenging fixture of the group phase did not prove more costly.
Champions League results on Wednesday:
At Manchester, England
Manchester City (ENG) 1 (Kolarov 74) Napoli (ITA) 1 (Cavani 68)
At Villarreal, Spain
Villarreal (ESP) 0 Bayern Munich (GER) 2 (Kroos 6, Rafinha 75)
At Lille, France
Lille (FRA) 2 (Sow 44, Pedretti 56) CSKA Moscow (RUS) 2 (Doumbia 72, 90)
At Milan, Italy
Inter Milan (ITA) 0 Trabzonspor (TUR) 1 (Celustka 75)
At Basel, Switzerland
Basel (SUI) 2 (Frei 39, 84-pen) Otelul Galati (ROM) 1 (Pena 58)
Benfica (POR) 1 (Cardozo 23) Manchester United (ENG) 1 (Giggs 41)
Dinamo Zagreb (CRO) 0 Real Madrid (ESP) 1 (Di Maria 52)
Ajax (NED) 0 Lyon (FRA) 0
Results on Tuesday:
Chelsea (ENG) 2 (Luiz 66, Mata 90+2) Bayer Leverkusen (GER) 0
At Genk, Belgium
Genk (BEL) 0 Valencia (ESP) 0
Olympiakos (GRE) 0 Marseille (FRA) 1 (Lucho 50)
At Dortmund, Germany
Borussia Dortmund (GER) 1 (Perisic 88) Arsenal (ENG) 1 (Van Persie 42)
At Oporto, Portugal
Porto (POR) 2 (Hulk 28, Kleber 51) Shakthar Donetsk (UKR) 1 (Luiz Adriano 12)
Apoel Nicosia (CYP) 2 (Manduca 73, Ailton 75) Zenit St-Petersburg (RUS) 1 (Zyryanov 63)
At Barcelona, Spain
Barcelona (ESP) 2 (Pedro 35, Villa 49) AC Milan (ITA) 2 (Pato 1, Silva 90+2)
At Pilsen, Czech Republic
Plzen (CZE) 1 (Bakos 45+1) Bate Borisov (BLR) 1 (Bressan 69)