However, it was Liverpool who added a third to seal the game thanks to new signing Jota, who scored 10 minutes after making his debut after another cross from the right.
Lautaro Martinez came off the bench to add the fifth for Inter with a rocket in the 72nd minute, and Caprari scored a consolation goal for Benevento four minutes later.
Liverpool piled on the pressure and Robertson made up for his earlier mistake when he controlled Trent Alexander Arnold's ball from the right before poking it past the Arsenal keeper.
A brand-new championship format amid strict epidemic prevention measures brought about unprecedented challenges -- each team been asked to play a game every four days, and even more regularly after the CFA Cup kicked off, which forced many clubs to deal with squads plagued with niggling injuries.
The second half was always going to be an anti-climax after the first 45 minutes, especially as there is another round of matches this week, but it allowed Koeman to bring Ousmane Dembele back for his first match in months after injury and allow new signings Francisco Trincao, Pedri and Miralem Pjanic to make their first team debuts. Enditem
Song, 18, cleared the bar at 5.30m on his second attempt after some setbacks at the heights of 5.00m and 5.15m.
The swimmers' performances at the championships will act as an important reference for their qualification for next year's Tokyo Olympic Games. Enditem
The side coached by Diego Martinez had kicked off their campaign with league wins at home to Athletic Club and Alaves, while also getting through two Europa League qualifying rounds, with a 4-0 victory away to Albanian outfit, Teuta and a 2-0 win at home to Locomotive Tbilisi a week ago.
Pliskova wasted eight set points in the opener but recovered quickly in the following two sets, serving out the contest on Court Philippe-Chatrier after two hours and 15 minutes.
41-year-old Baum is expected to take over as soon as possible but at the latest before the following 14-day long league break due to the national team's games.
Despite a difficult day, Hamilton retains the lead in the drivers' championship with 205 points, though Bottas has closed the gap and now sits second with 161 points, with Verstappen third on 128 points.