The second lot of fixtures from matchday 4 of the 2013/14 UEFA Champions League were completed on Wednesday night with Barcelona booking their place in the Round of 16.
The Catalan giants beat AC Milan 3-1 at the Camp Nou to move five points clear on top of Group H which has them six points and 11 goals ahead of third-placed Ajax.
Lionel Messi opened the scoring with a thunderous strike from the penalty spot on the half-hour mark after Neymar had been pulled back by Ignazio Abate in the area.
Sergio Busquets added a second ten minutes later when he headed home Xavi's free-kick without a defender near him before Gerard Pique's own-goal from Kaka's left-sided cross pulled one back for the Rossoneri on the stroke of half-time.
With seven minutes remaining, Messi moved to within seven goals of Raul's all-time Champions League scoring record of 71, when he deftly chipped over Christian Abbiati following a lovely ball from Cesc Fabregas.
Chelsea remained top of Group E courtesy of a 3-0 victory over Schalke at Stamford Bridge thanks to a brace from Samuel Eto'o, including a howler from opposing keeper Timo Hildebrand, and a late goal from Demba Ba.
Arsenal became the first English club to beat Borussia Dortmund at Westfalenstadion when they edged last season's runners-up 1-0 thanks to a second-half header from the in-form Aaron Ramsey as Napoli beat Marseille 3-2 in the other Group F fixture with Gonzalo Higuain netting a double.
Elsewhere, Atletico Madrid comfortably beat Austria Vienna 4-0, FC Porto held Zenit St Petersburg to a 1-1 draw, FC Basel and Steaua Bucharest drew 1-1 and Ajax edged Celtic 1-0.
2013/14 UEFA Champions League group stage scores - Matchday 4
Group E
FC Basel (SUI): 1 (Giovanni Sio 90+1') Steaua Bucharest (ROM): 1 (Federico Piovaccari 17') St Jakob-Park, Basel, Switzerland - 30,704
Chelsea (ENG): 3 (Samuel Eto'o 31'/54', Demba Ba 83') Schalke (GER): 0 Stamford Bridge, London, England - 41,194
Group F
Borussia Dortmund (GER): 0 Arsenal (ENG): 1 (Aaron Ramsey 62') Signal Iduna Park, Dortmund, Germany - 65,829
Napoli (ITA): 3 (Gokhan Inler 22', Gonzalo Higuain 24'/75') Marseille (FRA): 2 (Andre Ayew 10', Floran Thauvin 64') Stadio San Paolo, Naples, Italy - 39,148
Group G
Zenit St Petersburg (RUS): 1 (Hulk 28') FC Porto (POR): 1 (Lucho Gonzalez 23') Petrovsky Stadium, St Petersburg, Russia - 17,786
Atletico Madrid (SPN): 4 (Miranda 11', Raul Garcia 25', Filipe Luis 45', Diego Costa 82') Austria Vienna (AUT): 0 Vicente Calderon, Madrid, Spain - 29,841
Group H
Ajax (NED): 1 (Lasse Schone 51') Celtic (SCO): 0 Amsterdam Arena, Amsterdam, Holland - 59,908
Barcelona (SPN): 3 (Lionel Messi (p) 30'/83', Sergio Busquets 40') AC Milan (ITA): 1 (Gerard Pique (og) 45') Camp Nou, Barcelona, Spain - 80,517
