Match ends, Inter Milan 4, Frosinone 0.
Jonathan Biabiany scored on his first start since August 2014 to set Inter Milan on their way back to the top of Serie A with victory over Frosinone.
The winger, who rejoined Inter this summer, was diagnosed with a heart problem, arrhythmia, last year.
He fired home after a shot was parried and Mauro Icardi tapped in a second.
Inter added two late goals, with Jeison Murillo finishing from Stevan Jovetic's backheeled pass and Marcelo Brozovic driving in a fourth from 18 yards.
Napoli had gone top earlier on Sunday thanks to a 2-0 win at winless Verona, with Lorenzo Insigne and Gonzalo Higuain scoring midway through the second half.
Fiorentina then missed a chance to overtake them at the top. They had to come from 2-0 down to draw 2-2 with Empoli thanks to two goals from Nikola Kalinic.
Torino overtook Atalanta into ninth with a 1-0 win, while mid-table Chievo beat bottom side Carpi 2-1.
Lazio moved up to eighth with a 1-1 draw against Palermo and Udinese went four points clear of the relegation zone after beating Sampdoria 1-0.
Genoa are one of six clubs separated by a point from 11th to 16th thanks to a 2-1 win over Sassuolo. Leonardo Pavoletti scored a 95th-minute winner against his old club as both sides ended with 10 men.
- 55NagatomoSubstituted forRanocchiaat 60'minutes
- 25MirandaBooked at 26mins
- 11BiabianySubstituted forPerisicat 86'minutes
- 9IcardiSubstituted forBrozovicat 88'minutes
- 5Nunes Jesus
- 24DiakitéBooked at 10mins
- 17PaganiniBooked at 62minsSubstituted forCarliniat 83'minutes
- 5GoriSubstituted forGucherat 77'minutes
- 10SoddimoBooked at 40mins
- 9CiofaniSubstituted forLongoat 77'minutes
- Marco Guida
- Shots on Target
Second Half ends, Inter Milan 4, Frosinone 0.
Goal! Inter Milan 4, Frosinone 0. Marcelo Brozovic (Inter Milan) right footed shot from the right side of the box to the bottom left corner. Assisted by Adem Ljajic.
Foul by Ivan Perisic (Inter Milan).
Roberto Crivello (Frosinone) wins a free kick in the defensive half.
Foul by Marcelo Brozovic (Inter Milan).
Danilo Soddimo (Frosinone) wins a free kick in the defensive half.
Stevan Jovetic (Inter Milan) wins a free kick in the attacking half.
Foul by Paolo Sammarco (Frosinone).
Substitution, Inter Milan. Marcelo Brozovic replaces Mauro Icardi.
Goal! Inter Milan 3, Frosinone 0. Jeison Murillo (Inter Milan) right footed shot from the centre of the box to the bottom right corner. Assisted by Stevan Jovetic.
Substitution, Inter Milan. Ivan Perisic replaces Jonathan Biabiany.
Attempt saved. Stevan Jovetic (Inter Milan) right footed shot from the centre of the box is saved in the centre of the goal. Assisted by Adem Ljajic with a through ball.
Attempt blocked. Danilo Soddimo (Frosinone) right footed shot from outside the box is blocked. Assisted by Modibo Diakité.
Substitution, Frosinone. Massimiliano Carlini replaces Luca Paganini.
Foul by Alex Telles (Inter Milan).
Danilo Soddimo (Frosinone) wins a free kick in the attacking half.
Geoffrey Kondogbia (Inter Milan) wins a free kick on the left wing.
Foul by Nicolás Castillo (Frosinone).
Corner, Inter Milan. Conceded by Luca Paganini.