Barca, Milan draw at the San Siro

Milan, Italy ( - Barcelona and AC Milan shared the spoils with a 1-1 draw at the San Siro on Tuesday, keeping the two sides within two points of one another in Group H of the Champions League.

AC Milan was one goal to the good by the ninth minute as Robinho capitalized on a defensive miscue to release Kaka. The Brazilian played a return pass to Robinho, who slotted a shot past Victor Valdes from close range for his first Champions League goal of the campaign.

But Barcelona needed just 14 minutes to find an equalizer as Lionel Messi navigated his way through tight quarters in the penalty area before firing a low shot just inside the post.

Neither side managed to sneak a winning goal, keeping Barcelona atop the group on seven points and Milan closely behind on five.

Celtic moved up to third place in Group H thanks to a 2-1 defeat of Ajax at Parkhead. James Forrest's first-half penalty and Baram Kayal's deflected effort in the 53rd minute granted the Hoops a comfortable advantage, and they managed to close out the match and climb to three points despite Nir Biton's red card in the 88th and Lasse Schone's late strike in stoppage time.

Chelsea received a brace from Fernando Torres on Tuesday to earn a 3-0 defeat of Schalke. The Spaniard opened the scoring in fifth minute with a header at the back post and doubled Chelsea's advantage in the 68th by capping a fast break. He would have netted a hat trick when he made a deep run into the box late on, but Eden Hazard opted to go it alone and tack on a third for the visitors in the 87th minute.

The win sees Chelsea go level with the German side on six points apiece, though the Blues take the top spot through goal difference, while FC Basel retains third place following its 1-1 draw with Steaua Bucharest.

Group F action on Tuesday saw both visiting teams pick up maximum points as Robert Lewandowski netted an 82nd-minute winner in a 2-1 defeat of Arsenal while Jose Callejon and Duvan Zapata produced the goals in Napoli's 2-1 victory over Marseille. Arsenal, Dortmund and Napoli share the lead on six points apiece while Marseille bottoms the group on zero points.

Atletico Madrid maintained its unblemished record in Champions League football thus far by earning a 3-0 win at Austria Vienna. Raul Garcia notched the opening goal before Diego Costa added two of his own.

Zenit St. Petersburg moved up to second place in Group G, five points back of Atletico, thanks to a 1-0 defeat of FC Porto.