Juventus dealt a fresh blow to Eusebio Di Francesco's job security in a routine 1-0 win over an outclassed Roma at Allianz Stadium on Saturday.
Champions League semi-finalists last season, Roma have been a shadow of their former selves this term and were no match for the Serie A champions despite the narrow final scoreline.
Mario Mandzukic's commanding header, his eighth league goal of the campaign, gave Juve a deserved half-time lead and they were rarely troubled in restoring an eight-point gap to second-placed Napoli, who earlier beat SPAL 1-0.
Robin Olsen's string of stellar saves ultimately achieved little more than keeping the score down as the under-pressure Di Francesco was left to defend a run of just one victory in seven competitive matches.