AC Milan's Zlatan Ibrahimovic (L) celebrates with his team mate Antonio Cassano after scoring against Viktoria Plzen in their Champions League Group H soccer match at Giuseppe Meazza stadium in Milan Sept 28, 2011. [Photo/Agencies]

Holders Barcelona barely broke a sweat in a ruthless 5-0 hammering of BATE Borisov while former champions AC Milan made harder work of finding the net before overcoming new boys Viktoria Plzen 2-0 in the Champions League on Wednesday.

Lionel Messi drew level with Ladislau Kubala as Barca's second highest scorer of all time thanks to a double in a dominant performance on a rainy night in Minsk as the Spaniards went joint top of Group H along with Milan.

Seven-times champions Milan needed second-half goals to break the deadlock against Czech side Plzen at the San Siro with Zlatan Ibrahimovic converting a 53rd-minute penalty and setting up Antonio Cassano for the second 13 minutes later.

On a good night for former European champions, Olympique Marseille distanced themselves from a poor domestic campaign to demolish Borussia Dortmund 3-0 as the German champions matched their lacklustre early Bundesliga form.

"It was not perfect but we've got six points," was the verdict of Marseille coach Didier Deschamps, who watched a sour end to the game when substitute Jordan Ayew was sent off in stoppage time, picking up a second yellow card for diving.

Brother and Ghana forward Andre Ayew scored twice for the hosts and France striker Loic Remy got the other as they maintained their perfect start in Group F, where they have a two-point lead over second-placed Arsenal.

Arsene Wenger's side enjoyed a better outcome to fellow English club Chelsea in nervy endings to their games, holding on to an early lead to beat Olympiakos Piraeus 2-1 while Andre Villas-Boas' men conceded a late penalty to draw 1-1 in Valencia.

While Wenger watched the game from the stands as he served the last match of his touchline ban, teenager Alex Oxlade-Chamberlain made a dream start to his European debut with an eighth-minute opener.

The injury-hit London side were two up after 20 minutes through Brazilian left back Andre Santos before the Greek visitors got back into the game with a David Fuster header on 27 minutes and from then on Arsenal merely hung on.