Champions League:Dimitar Berbatov scored twice for Manchester United as the defending champions beat Aalborg 0-3 in Denmark. Arsenal bounced back from their shock home defeat to Hull City in style with a 4-0 over FC Porto but Celtic were again beaten on the road thanks to a Marcos Senna goal for Villaraeal.
United's sluggish start to the season may just be a thing of the past after Wayne Rooney and Berbatov both found the net but Bruce Rioch's side.
Republic of Ireland defender john O'Shea made a rare Champions League start in midfield with Paul Scholes but the latter was forced off with knee ligament damage within 20 minutes.
Ryan Giggs replaced his long-time team-mate and promptly set-up Rooney for the opener with a measured pass in behind the defence that allowed the England striker to pick his spot in the bottom left-hand corner.
Berbatov expertly blasted home his first in the 55th minute after a poor touch by Thomas Augustinussen gifted him the ball on the edge of the box.
The Bulgarian, who joined United from Tottenham Hotspur earlier this season for €37million, doubled his tally in the 79th minute with neatly executed volley after a cross from Cristiano Ronaldo.
Group E opponents Villarreal had a magnificent 67th minute free-kick from Senna to thank for narrow win over Gordon Strachan's side, who have yet to win away in this competition.
The Spain international left goalkeeper Artur Boruc sprawling when he swept a 25-metre effort from the left over the wall and into the bottom left hand corner.
Celtic had soaked up some intense pressure yet it was their Greek striker Georgios Samaras who had the best chance of the first half when he raced clear on the right only to flick his 10 yard shot against Diego Lopez.
Villarreal controlled long periods of the game and Boruc brilliantly denied Joseba Llorente in the final minutes with a near-post block.
Arsenal demolished a feeble Porto side at the Emirates with two goals each from Robin van Persie and Emmanuel Adebayor firing them to the top of Group G.
Dutchman Van Persie settled some early Arsenal jitters to slot the opener after 31 minutes before Adebayor headed the second shortly before halftime.
Porto, who have never won in England, capitulated after the break and Van Persie waltzed through to make it 3-0 before Adebayor converted a penalty with 19 minutes remaining.
The visitors had hit the crossbar through Cristian Rodriguez when the score was 0-0 but were outplayed as Arsenal recorded their first win in this season's competition after drawing their opener 1-1 with Dynamo Kiev.
Kiev held Fenerbahce to a 0-0 draw in Turkey.
