Match ends, Young Boys 0, Manchester United 3.
Paul Pogba scored twice as Manchester United opened their Champions League Group H campaign with a comfortable win over Young Boys in Bern.
Linking with Brazilian Fred, Pogba was inventive and precise for his first goal, checking on to his left foot and finding the top left corner from 18 yards.
The France midfielder then doubled his tally with a penalty after home defender Kevin Mbabu was judged to have handled Luke Shaw's cross.
Anthony Martial, recalled at the expense of Alexis Sanchez, added the gloss midway through the second period, with a strike that deflected past Young Boys goalkeeper David von Ballmoos.
Until Pogba's intervention, the hosts had enjoyed the better of the play as Jose Mourinho's side struggled for fluency on the Swiss side's artificial pitch.
Buoyed by the constant singing and drumming of their passionate supporters, Young Boys' former Paris St-Germain forward Guillaume Hoarau headed wide early on.
And United goalkeeper David de Gea also impressively tipped efforts from Mohamed Ali Camara and Christian Fassnacht over the bar.
Yet the visitors, who had earlier clipped the post through Marcus Rashford, settled after Pogba's contribution.
Juan Mata twice had chances to add to the score for last season's Premier League runners-up, who enjoyed their first Champions League victory in Switzerland since Ruud van Nistelrooy and Ole Gunnar Solskjaer scored in a 3-1 win in Basel 16 years ago.
When Manchester United re-signed Paul Pogba for a then world-record transfer fee of £89m in 2016, it was to deliver match-winning contributions on the grandest stages.
But two-goal contributions of this nature, or performances where he has carried his team-mates with him, have been sporadic.
The French World-Cup winning midfielder scored twice against Turkish side Fenerbahce in his first season back at Old Trafford.
But he then had to wait almost 18 months before repeating that feat when delaying Manchester City's Premier League title parade with a 3-2 win last April.
Adding consistency and honing his role in Mourinho's side have so far proved challenging for the midfielder who spent four years at Juventus in the altogether different environment of Serie A.
However, there are signs that he is now starting to embrace greater responsibility.
Following on from strong showings against Burnley and Watford, this was a true captain's performance.
It brought two goals and just as importantly a concentrated effort to retain possession, with 93% of his passes finding their intended target.
Young Boys will rightly feel that the scoreline flattered United on their return to European football's elite competition after a 31-year absence.
But while they have scored 19 goals in six domestic matches, storming to the summit of the Swiss Super League and establishing an eight-point gap, the visit of United proved a step up in class.
Gerardo Seoane's side could not be faulted for effort though - fashioning 18 attempts on goal to United's 16.
At least three of those could have resulted in goals but ultimately did not possess the individual class of a Pogba - whose composure and accuracy brought the opening goal - or the excellence of visiting goalkeeper De Gea.
The Spaniard saved all four of the hosts' shots on target and alongside Pogba ensured that they paid for their profligacy.
Manchester United manager Jose Mourinho, speaking to BT Sport: "Job done. Not phenomenal but good enough. They were intense, compact and had self-esteem. Then after the first goal, the game was under control. We tried to score the goals that gave us the stability for the second half.
"It is important for us to win because probably every team is going to get six points against Young Boys. Now we have two important matches against Valencia and Juventus. They are very good opponents."
On the home side's artificial pitch: "There was probably some fears of injuries. I had some players who were feeling sore after training yesterday. People are more used to playing on great surfaces in England. The football is much more beautiful that way.
"Now the game is over, I can say I don't understand how you can play the best club football on an artificial pitch.
United welcome Spanish club Valencia to Old Trafford for their next European game on 2 October (20:00 BST). Young Boys travel to Turin to face Juventus on the same date (17:55 BST).
Match ends, Young Boys 0, Manchester United 3.
Second Half ends, Young Boys 0, Manchester United 3.
Offside, Manchester United. Diogo Dalot tries a through ball, but Romelu Lukaku is caught offside.
Marouane Fellaini (Manchester United) wins a free kick in the defensive half.
Foul by Moumi Nicolas Ngamaleu (Young Boys).
Attempt missed. Andreas Pereira (Manchester United) right footed shot from outside the box misses to the right. Assisted by Luke Shaw.
Nemanja Matic (Manchester United) wins a free kick in the attacking half.
Foul by Moumi Nicolas Ngamaleu (Young Boys).
Attempt missed. Jean-Pierre Nsame (Young Boys) header from the centre of the box misses to the left. Assisted by Kevin Mbabu.
Offside, Young Boys. Loris Benito tries a through ball, but Miralem Sulejmani is caught offside.
Attempt saved. Moumi Nicolas Ngamaleu (Young Boys) left footed shot from the centre of the box is saved in the top centre of the goal. Assisted by Jean-Pierre Nsame.
Attempt missed. Miralem Sulejmani (Young Boys) left footed shot from the right side of the box misses to the left. Assisted by Roger Assalé.
Attempt missed. Juan Mata (Manchester United) left footed shot from the centre of the box is high and wide to the left. Assisted by Anthony Martial.
Roger Assalé (Young Boys) is shown the yellow card for a bad foul.
Attempt missed. Juan Mata (Manchester United) left footed shot from the centre of the box is close, but misses to the left. Assisted by Luke Shaw with a cross.
Attempt missed. Jean-Pierre Nsame (Young Boys) right footed shot from a difficult angle on the right misses to the left. Assisted by Sekou Sanogo.
Foul by Andreas Pereira (Manchester United).
Sekou Sanogo (Young Boys) wins a free kick in the defensive half.
Substitution, Manchester United. Andreas Pereira replaces Paul Pogba.
Substitution, Young Boys. Jean-Pierre Nsame replaces Guillaume Hoarau.
Mohamed Ali Camara (Young Boys) hits the right post with a right footed shot from very close range. Assisted by Miralem Sulejmani with a cross following a corner.
Corner, Young Boys. Conceded by Luke Shaw.
Attempt missed. Michel Aebischer (Young Boys) right footed shot from the right side of the box is too high.
Foul by Chris Smalling (Manchester United).
Moumi Nicolas Ngamaleu (Young Boys) wins a free kick in the attacking half.
Substitution, Manchester United. Marouane Fellaini replaces Fred.
Substitution, Manchester United. Juan Mata replaces Marcus Rashford.
Goal! Young Boys 0, Manchester United 3. Anthony Martial (Manchester United) right footed shot from the left side of the box to the bottom left corner. Assisted by Paul Pogba following a fast break.
Substitution, Young Boys. Moumi Nicolas Ngamaleu replaces Christian Fassnacht.
Foul by Marcus Rashford (Manchester United).
Kevin Mbabu (Young Boys) wins a free kick in the defensive half.
Attempt blocked. Marcus Rashford (Manchester United) right footed shot from outside the box is blocked.
Anthony Martial (Manchester United) wins a free kick in the attacking half.
Foul by Michel Aebischer (Young Boys).
Paul Pogba (Manchester United) wins a free kick in the defensive half.
Foul by Sekou Sanogo (Young Boys).
Foul by Paul Pogba (Manchester United).
Sekou Sanogo (Young Boys) wins a free kick in the defensive half.
Attempt saved. Marcus Rashford (Manchester United) right footed shot from outside the box is saved in the centre of the goal. Assisted by Nemanja Matic.
Delay over. They are ready to continue.