Galatasaray thrash 10-man Juve in Champions League play-off 1st leg
In a nerve-shredding atmosphere, Luciano Spalletti's Juventus actually led 2-1 at half-time after Teun Koopmeiners replied to Brazilian midfielder Gabriel Sara's opener with a brace of his own.
But Colombian full-back Juan Cabal was dismissed for two bookings in a calamitous second half as Lang's brace and goals from Davinson Sanchez and Sacha Boey sunk the Old Lady, who faced a miserable return to Turin.
Sara opened the scoring with a slick left-footed strike from just inside the box on 15 minutes, but that lead was short-lived.