Wayne Rooney scored two penalties as Manchester United beat Otelul Galati to register their first Champions League win of the season.
After a low-key first half, Rooney netted from the spot after his cross was handled by Sergio Costin.
United soon went down to 10 men when Nemanja Vidic was harshly shown red for a foul on Gabriel Giurgiu.
Otelul's Milan Perendija received a second yellow before Rooney struck again after a foul by Liviu Antal.
Following draws against Benfica and Basle in their opening two group games, the victory will come as relief to United, but it was not a fluent display from Sir Alex Ferguson's side as they struggled to create chances against the organised Romanian champions.
Rooney, one of nine changes from the side that drew 1-1 with Liverpool on Saturday, found chances hard to come by as he was closely marked in Bucharest. However, he did produce the two moments of creativity which led to Otelul conceding the penalties.
United dominated possession early on but a loose pass from Vidic gifted Bratislav Punosevac the first shot on goal, 20 yards out, but his weak effort was easily gathered by Anders Lindegaard.
The visitors stayed on top, but struggled to break through Otelul, who occasionally threatened themselves. United had their best chance of the half when Nani cut the ball back for Michael Carrick who should have done better than tamely shooting over.
But the Romanian side threatened again just before half-time as Liviu Antal out-jumped Patrice Evra only to head over.
There was more urgency from Ferguson's men early in the second half and Rooney was a pivotal figure. He came close from a Nani cross, when he spun and shot wide from 12 yards out.
The England striker then produced the moment that led to his first penalty, crossing from the left-hand edge of the 18-yard box.
Costin's hand prevented the ball reaching Javier Hernandez, with Rooney sending Branko Grahovac the wrong way with from the resulting spot-kick.
Two minutes later, the visitors were stunned as Vidic, returning to the United side after a calf injury, was shown a straight red card for a tackle on Giurgiu that, while high and late, did not appear to warrant a dismissal.
Otelul were lifted by the Serb's dismissal, with Antal's eight-yard attempt charged down by Carrick and Costin heading over when unmarked.
But after Perendija got his second yellow, Nani's 30-yard strike came back off the post before Rooney wrapped it up from the spot after being brought down by a tiring Antal.