Inter Milan missed the chance to book their place in the last 16 of the Champions League as they were held to a thrilling 3-3 draw by Anorthosis Famagusta.
Anorthosis goalkeeper Arjan Beqaj gifted the Italians the lead in the 13th minute, allowing Mario Balotelli to score, before a defensive calamity saw Inter return the favour with Cedric Bardon profiting on the half-hour mark.
Both sides scored another right at the end of the half through Marco Materazzi and substitute Giorgos Panagi.
Nikolaos Frousos gave the hosts the lead early in the second half but Inter snatched a deserved point thanks to Julio Cruz 10 minutes from time.
Inter remain top of Group B, three points ahead of second-placed Anorthosis.
In Group B's other match, Werder Bremen were stunned 3-0 at home to Panathinaikos, Vangelis Mantzios (58), Giorgos Karagounis (70) and Alexis Tziolis (83) grabbing the goals for the Greek outfit, who move above Bremen into third place.
Two costly errors by John Mikel Obi sent 10-man Chelsea crashing to shock defeat to Serie A strugglers Roma.
The hosts stormed into a three-goal lead inside 58 minutes thanks to Christian Panucci and two goals from Mirko Vucinic.
Chelsea reduced the deficit through captain John Terry in the 75th minute but it was not enough to save them from a humiliating defeat, their worst in Europe since their 5-1 extra-time thrashing by Barcelona in 2000.
Chelsea's Group A opponents Bordeaux defeated CFR Cluj 2-1. Yoann Gourcuff handed the French outfit the lead after six minutes but Dani levelled for the hosts 10 minutes later.
Silva Wendell hit the winner for the visitors seven minutes before the break as Bordeaux moved onto six points, level with Roma and two points clear of rock-bottom Cluj.
Basle substitute Eren Derdiyok struck seven minutes from time as Barcelona forfeited their 100% record in Champions League Group C, although the point was enough to book their place in the knockout stages.
The hosts had been expected to coast past their Swiss visitors after recording a 5-0 triumph in Basle a fortnight ago.
But that was not the case as they endured a frustrating night in front of goal until Lionel Messi stepped off the bench to score after 61 minutes.
Sporting Lisbon also progressed from Group C after a narrow 1-0 win over Shakhtar Donetsk, Vanderlei Derlei grabbing the only goal of the game 17 minutes from time.
Steven Gerrard drove home a controversial penalty four minutes into injury time to salvage a dramatic Champions League point for Liverpool.
Atletico will believe they were robbed of a place in the last 16 by referee Martin Hansson's hotly disputed penalty award for a debatable foul on Gerrard by Mariano Pernia.
They had led from the 37th minute following a cleverly constructed Maxi Rodriguez goal and frustrated Liverpool at every turn.
But Gerrard never gave up and his penalty eventually spared Liverpool's blushes and both sides should advance to the last 16.
Mamadou Niang grabbed a second-half brace as Marseille got their Group D campaign up and running with a win over PSV Eindhoven at the Stade Velodrome.
OM needed to win to keep alive their hopes of a top-two finish and they did so in fine style, Bakari Kone opening the scoring after 30 minutes.
Strike partner Niang then marked a fine personal display by scoring twice in the space of eight minutes midway through the second half.
The result leaves both sides five points shy of Liverpool and Atletico with two games to play.