Juventus's winning start to the season is under threat after they went in at half time level with bottom-of-the-table Sassuolo.
A shock was on the cards early on when Simone Zaza latched onto a pass played into his path to place the ball beyond the reach of Gianluigi Buffon and put the hosts ahead.
Sassuolo's lead lasted for just four minutes, though, as Paul Pogba found the top corner of the net from range to level up the contest in style.
Angelo Ogbonna very nearly edged the Old Lady into the lead when he tried his luck with a shot from the edge of the box, only for his effort to fly narrowly over the crossbar.
Juventus upped the pressure in search of a second before the interval, and they came close to finding it when Pogba weaved his way into the box to drill a shot which was well kept out by Andrea Consigli.