Cristiano Ronaldo scores as Juventus extend perfect start to Serie A season - in pictures

Elsewhere in Italy's top flight, Roma continued their poor start to the season with defeat against Bologna

Cristiano Ronaldo turns to celebrate after scoring Juventu's first goal against Frosinone. EPA

Cristiano Ronaldo goes down under the challenge of Frosinone midfielder Raman Chibsah. AFP

Frosinone's fans cheer and wave flags during the game against Juventus. AFP

Cristiano Ronaldo has a shot at goal during Juventus' Serie A match against Frosinone. Getty Images

Juventus manager Massimiliano Allegri delivers instructions from the touchline. AFP

Federico Bernardeschi celebrates with Cristiano Ronaldo after scoring Juventus's second goal. AFP

Cristiano Ronaldo celebrates after scoring Juventus' first goal. Reuters

Juventus players celebrate in front of their fans after defeating Frosinone. AFP

Frosinone and Juventus players line up at the start of their Serie A match. Getty Images

Cristiano Ronaldo has a shot at goal. AFP

Cristiano Ronaldo takes on Frosinone defender Marco Capuano. AFP

Juventus forward Paulo Dybala takes on Frosinone's Marco Capuano. EPA

Cristiano Ronaldo responded to his red card in midweek by scoring for Juventus on Sunday to help the Italian champions extend their perfect start to the Serie A season.

Juve made it five successive victories with a 2-0 win over Frosinone, with club record signing Ronaldo scoring the opener on 81 minutes. Federico Bernardeschi then made sure of the three points with an injury time goal.

Ronaldo's goal - his third in five games - was the ideal response after his unfortunate sending off at Valencia on Wednesday in what was his Uefa Champions League debut for Juventus.

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Massimiliano Allegri’s side, who are chasing an eighth consecutive Italian league title, have now won their opening five league games for the third time in five seasons.

Frosinone have picked up just one point this season and are still waiting to score their first goal, but provided a surprisingly stern test for the champions.

Roma manager Eusebio di Francesco’s position is under increasing scrutiny after his side's 2-0 defeat by Bologna which club president James Pallotta said made him feel "disgusted".

Bologna went into the game without a win or a goal to their name this season but strikes from Federico Mattiello and Federico Santander gave Pippo Inzaghi’s side their first home win against the capital club since 2004 and left Roma in 14th place with five points.

“If something doesn’t snap inside the players, then we’re going to struggle,” said Di Francesco. “We could just sit there in front of the goal and hope the right cross comes in but that is not my philosophy of football.”

Napoli continue to look like Juve’s most likely challengers after beating Torino 3-1 thanks to a Lorenzo Insigne double and a Simone Verdi strike.

Carlo Ancelotti’s side have won four of their five Serie A games so far and occupy second place, three points behind the leaders.

Atalanta scored a stoppage-time equaliser to earn a 2-2 draw with AC Milan at San Siro, Lazio moved into fifth place with a 4-1 win at home to Genoa and Chievo remain bottom of the pile after falling to a 2-0 home defeat to Udinese.