LONDON (AP) Borussia Dortmund and Chelsea recovered from poor starts in the Champions League by winning their first group matches on Tuesday, while Barcelona beat 10-man Celtic 1-0 to avoid a second consecutive loss at Celtic Park.
Robert Lewandowski scored a brace as Dortmund, last-season's runner-up, defeated Marseille 3-0 in Group F. Arsenal leads the group with six points after a 2-0 win over Napoli.
Chelsea kick-started its campaign with a 4-0 rout of Steaua Bucharest in a Group E dominated by Schalke.
Missing the injured Lionel Messi, Barcelona earned a workmanlike second win in Group H, courtesy of Cesc Fabregas' strike at the scene of last season's shock defeat.
Mario Balotelli converted a penalty in the fourth minute of injury time to give AC Milan a 1-1 draw against Ajax.
