But City were refusing to give up and pulled a goal back in spectacular fashion, Trabelsi shooting high past Van der Sar with an angled drive from 18 yards.
BBC: Wayne Rooney celebrates putting Man Utd ahead in the derby
In the case of the Hong Kong SAR, an official report about the manpower requirements and supply to the region until 2018 provided some insight into its most pressing needs for professionals.
Fabregas was at the centre of affairs again, punishing United for failing to pick up Nasri when he threaded through a perfect pass for the France midfield man to beat Van der Sar with an emphatic finish.
And minutes after Ivica Krizanac had forced Edwin van der Sar into an instinctive save from close range, Zenit's pressure finally told when Pogrebnyak forced the ball over the line after Igor Denisov had flicked on Dominguez's corner seconds before half-time.
The goal breathed a new lease of life in the visitors and, five minutes later, they were gifted an equaliser when Van Der Sar shockingly spilled a looping Brunt cross to allow Tchoyi to sidefoot in.
And Drogba wasted no time in making more of an impression that the struggling Spaniard, firing in an effort that left Van der Sar scrambling and a free-kick that the keeper was forced to punch to safety.
Belgian defender Vanden Borre tried to make amends with a decent shot which was well saved by Edwin Van der Sar, who also smothered an effort from Nadir Belhadj.
After Gabriel Agbonlahor hit an early chance straight at Edwin van der Sar, Ashley Young's tackle prevented Ji-Sung Park from giving United the lead.
Better work from Earnshaw saw the Welshman fashion an opening after nine minutes, but Van der Sar was equal to the shot.
But it was Barcelona who approached half-time in control and Messi underlined their dominance with a surging run which took him away from four players before his shot from an acute angle was partly fumbled by van der Sar.
He beat Van der Sar with his curling effort, but it rebounded off an upright to safety.
The Frenchman had an early sighter with a near post shot that Edwin van der Sar held comfortably, and he forced a far more impressive save from the Dutchman just after the half hour with a left-foot curler that the keeper had to beat away on the stretch.
Torres made an energetic start and Drogba forced a fine fingertip save from Van der Sar with a rising drive from the angle as Chelsea attempted to apply early pressure.
The cloud cover associated with rainforests makes Sar something of a game-changer in that sense, allowing repeat viewing of an area on a frequent basis whatever the weather.
"Such an arrangement will serve as a buffer for the chief executive and will ultimately help stabilize the SAR government, " says Lee Pang Kwong, a political scientist at Ling Nan College.
Messi and Ronaldo took turns to show their skill, with the Argentine blazing a shot over from outside the area which left Edwin van der Sar shaking his head and Ronaldo setting himself up again with neat footwork before sending an effort wide.
"We are not a command economy, " sniffs the SAR's secretary for trade and industry, Brian Chau Tak-hay, in an interview with the South China Morning Post.
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