The 31-year-old steered a header in off the far post in the second half at Stadio Olimpico as Rudi Garcia's men set a new Serie A record with their blistering start to the season
The 31-year-old steered home Alessandro Florenzi's cut-back on 67 minutes to secure maximum points at Stadio Olimpico and set a new record in Serie A as Roma's perfect start to the campaign continues.
Rudi Garcia's men now boast a record that no team in the history of the Italian top flight can lay claim to, even the Juventus team of 2005-06, whose nine-match winning run from the start of the season is no longer recognized after its results were expunged for match-fixing.
The hosts made three changes from the side that beat Udinese on Sunday, with Vassilis Torosidis deputizing for the suspended Maicon, while Florenzi had to be content with a place on the bench after Marquinho was preferred.
Chievo, which surrendered a one-goal lead to lose 2-1 at home to Fiorentina on Sunday, brought in four new faces, as Dario Dainelli, Gennaro Sardo, Sergio Pellissier and Luca Rigoni were all called up.
Roma applied early pressure but found it difficult to break through as Chievo defended resolutely.
And when opportunities did come its way, Roma was wasteful - Borriello and Kevin Strootman in particular fluffing good first-half chances.
Christian Puggioni was forced into the first save of the match midway through the half when Strootman collected the ball 30 yards from goal and let fly from the edge of the penalty area, with the Chievo goalkeeper punching clear.
It was a similar story after the interval, with Roma controlling possession and forcing the issue, only to find the away side in determined mood.
But, just as Chievo was daring to dream, Florenzi and Adem Ljajic linked well on the left-hand side of the box, with the former bustling past his man and lobbing in a cross that Borriello headed into the far corner from six yards for his first goal of the campaign.
Chievo thought it had won a penalty when Pellissier was fouled from behind by Mehdi Benatia, but the offside flag had already been raised.
And that was as close as Chievo came to scoring an equalizer, as Roma held on for a slender victory to move five points clear of Napoli and Juventus, while the Gialloblu remain rock-bottom on just four points.