Inter Milan and Bayern Munich, the two 2010 Champions League finalists, were stunned by late goals as they both crashed to 1-0 defeats in the first leg of the last 16 of the competition.
Basel rocked Bayern Munich when substitute Valentin Stocker rifled the ball through the legs of keeper Manuel Neuer with four minutes remaining.
Wednesday’s result gives the Swiss champions every chance of causing an upset in the return leg in Munich on March 13.
Inter Milan, who beat Bayern in the 2010 final, conceded a header from Olympique Marseille’s Ghana midfielder Andre Ayew in the third minute of stoppage time in Marseille.