London, September 14 :

Real Madrid tumbled at Lyon 2-0 while AC Milan and Arsenal opened with impressive Champions League victories on Wednesday. Manchester United also won, edging Celtic 3-2 at Old Trafford.

Six-time European champion Milan beat AEK Athens 3-0 and Arsenal, last season’s runner-up, began its campaign with a 2-1 win at Hamburger SV despite the absence of the injured Thierry Henry.

French champion Lyon could have been four goals up by halftime at Stade Gerland. Fred scored in the 11th minute and Tiago added a second in the 31st while but Florent Malouda hit the crossbar and the Madrid defenders made frequent mistakes under pressure.

In the other Group A game, Nicolae Dica scored twice as Steaua Bucharest beat Dynamo Kiev 4-1.

Jan Vennegoor gave Celtic a 21st-minute lead at Old Trafford. Two-time champion United was lucky to get a penalty for Louis Saha to level, and the France striker made it 2-1. Shunsuke Nakamura equ-alised two minutes before halftime with a direct free kick, and Ole Gunnar Solskjaer made it 3-2 for United early in the second half.

Arsenal was fortunate to go ahead in the 12th minute in Hamburg when goalkeeper Sacha Kirschstein was penalised and sent off for a trip and Brazil midfielder Gilberto Silva scored from the penalty spot. Tomasz Rosicky scored the second from 20 yards. Boubacar Sanogo replied for Hamburg in the final minute.

A 0-0 draw between FC Porto and CSKA Moscow meant that Arsenal is in first place in Group G.