Bologna held leaders Juventus to a goalless draw at the Stadio Renato Dall'Ara on Friday to end the reigning champions' 15-game winning streak in Serie A.
Massimiliano Allegri's men had not dropped points since their 1-0 defeat at the hands of Sassuolo back in October and went top for the first time this season last Saturday after beating Napoli, but Juve will drop to second place again if the Naples side beat AC Milan on Monday.
Patrice Evra threatened twice in the opening 45 minutes, but the best chances fell Bologna's way to Mattia Destro and Godfred Donsah, with the latter wasting a gilt-edged opportunity to break the deadlock.
Paul Pogba saw three second-half chances go begging as it remained 0-0, Juventus' seventh consecutive Serie A clean sheet.
Evra came close for Juve early on when he beat his marker to the ball after Claudio Marchisio's corner from the left, but the Frenchman's header went just wide.
Pogba could have broken the deadlock for Juventus in the 54th minute after some great work from Stephan Lichtsteiner down the right, but he volleyed inches wide after the Switzerland international's good cross.
Destro tried his luck with a free-kick from 20 yards out with 15 minutes left on the clock, yet the former Roma man's attempt went harmlessly over.
