Milan: Olivier Giroud scored his first two league goals for AC Milan as the Rossoneri beat Cagliari 4-1 in Serie A.
All the goals came in the first half with Giroud scoring Milan's last two after early strikes from Sandro Tonali and Rafael Leão. Alessandro Deiola briefly made it 1-1 for Cagliari on Sunday.
It was a second win in as many games for Milan, which is still without Zlatan Ibrahimovic. The veteran forward remains out after injuring his knee in May and needing surgery.
José Mourinho's Roma also scored four goals as it won 4-0 at newly promoted Salernitana.
In Milan, the home side opened the scoring when Tonali curled a free kick into the top near corner in the 12th minute. It was also his first goal for Milan and only a second in Serie A for the former Brescia midfielder.
Cagliari leveled three minutes later as Deiola headed in a delightful lofted pass from João Pedro but Milan restored its lead almost immediately when Leão's effort was deflected in.
Giroud joined Milan from Chelsea in the offseason and the 34-year-old scored his first goal in the 24th. Brahim Díaz raced forward from the center of midfield and sent a ball through to Giroud, who fired it into the far side of the net.
Giroud also converted a penalty two minutes from halftime after Cagliari midfielder Kevin Strootmann handled the ball just inside the penalty area.
Salernitana had narrowly lost its first match back in the top flight for more than 20 years as it was defeated 3-2 by Bologna last week.
It was a lot more humiliating in its first home match following a second-half capitulation.
Lorenzo Pellegrini broke the deadlock three minutes into the second half and also scored Roma's fourth.
New forward Tammy Abraham opened his Roma account in the 69th following a goal from Jordan Veretout.
The 23-year-old Abraham is enjoying a fantastic start to life in Serie A after setting up both his side's goals and hitting the crossbar in a 3-1 win over Fiorentina last week.
Abraham recently joined Roma from Chelsea for 40 million euros ($47 million).
Substitute Andrea Petagna scored two minutes after coming off the bench as Napoli also made it two wins out of two with a 2-1 victory at Genoa.
Petagna's goal came with six minutes remaining after Genoa midfielder Andrea Cambiaso had canceled out Fabián Ruiz's opener.
Sassuolo drew 0-0 with Sampdoria.