( CNN ) -- Cristiano Ronaldo has attracted much of the spotlight this week , signing a new contract at Real Madrid that reportedly makes him football 's best-paid player and netting a hat-trick against Galatasaray in the Champions League . You just knew Lionel Messi , Ronaldo 's rival in La Liga , would respond . Messi scored three goals himself to take him closer to Raul 's all-time record in Europe 's top club competition and Barcelona thumped Ajax 4-0 to earn maximum points at the Camp Nou . For all of its possession in the early stages , Barcelona failed to unlock the Ajax defense until Messi won a free kick at the edge of the box . The Argentine took the free kick and put the ball past a helpless Kenneth Vermeer in the 21st minute to start the rout against the Dutch champion . Messi doubled the advantage with another left-footed finish after good work from midfielder Sergio Busquets in the 55th minute before completing his treble in the 75th . With 62 Champions League goals , the four-time player of the year could match or exceed Raul 's tally of 71 sometime this season . Ajax 's misery was complete when Victor Valdes saved Kolbeinn Sigthorsson 's late penalty . `` It was important to start with a win , especially playing at home , '' Messi told Spain 's Canal Plus . `` We know how difficult these Champions League groups always are . In the second half we had the ball and controlled the match . `` We found it tough to pressure them initially because they were moving the ball well out from the back . But I think in general it was a great performance . '' Barcelona manager Gerardo Martino will now fly back to his native Argentina to be with his family following the death of his father . Barcelona and AC Milan are expected to advance from Group G , and Milan beat poor traveler Celtic 2-0 at the San Siro with two goals in the final seven minutes . One was an own goal by defender Emilio Izaguirre . Milan was far from convincing , with the Scottish champion looking the more threatening throughout . Chelsea stunned . Chelsea has endured a slow start to its league campaign under prodigal son Jose Mourinho but an away loss to Everton on Saturday paled in comparison to Wednesday 's 2-1 reverse -- at home -- to Basel . Chelsea , the tournament winner two seasons ago and knocked out in the group stage last December , labored for most of the first half but took the lead on Oscar 's low shot to the far corner deep in the first half . Instead of adding to its advantage , Chelsea remained uninspired -- barring Oscar 's shot that struck the crossbar -- and paid the price when Mohamed Salah leveled in the 71st . Marco Streller 's near-post header 10 minutes later gave Basel the win . Chelsea had eased past Basel 5-2 on aggregate in the Europa League in the spring . `` I 'm the manager , '' Mourinho told Sky Sports . `` I 'm responsible for everything , especially in the bad moments . `` Tomorrow I will not wake up with a smile on my face but I have to wake up again . `` We have to get the points ... in the Champions League . We do n't want to play in the Europa League . '' Elsewhere in Group E , Schalke 04 did n't stumble at home , blanking outsider Steaua Bucharest 3-0 . Not a good start for Dortmund . Last season 's runner-up to Bayern Munich , Borussia Dortmund endured a miserable evening in Italy , falling 2-1 to Rafael Benitez 's Napoli in Group F. Goalkeeper Roman Weidenfeller was shown a red card in first-half stoppage time for handling outside the box and manager Jurgen Klopp was earlier sent to the stands for berating the fourth official . Aaron Ramsey continued his fine form for Arsenal , meanwhile , scoring the second goal in the Gunners ' 2-1 win at Marseille after the Londoners ' fluent passing game failed to click in the first half . In Group H , Atletico Madrid beat Zenit St. Petersburg 3-1 to maintain its impressive home record in Europe and FC Porto edged debutant Austria Vienna 1-0 .
Lionel Messi moves closer to matching Raul 's record in Lionel Messi . Barcelona , a day after Cristiano Ronaldo 's hat-trick , scores 2 goals as Barcelona beat Ajax . Chelsea suffers a shock 2 -1 defeat at home to Basel after taking the lead . a day finalist , Borussia Dortmund , loses 2 -1 at Cristiano Ronaldo 's Napoli .