Liverpool extend unbeaten run
Liverpool made them pay on 16 minutes, when Mohamed Salah won and converted a penalty. It made Salah the fifth player to either score or assist in each of his team's first six matches of a Premier League season, after David Beckham for Manchester United in 2000/01, Thierry Henry for Arsenal in 2004/05, Sergio Aguero for Manchester City in 2019/20 and Erling Haaland for Man City in 2022/23.
Liverpool went back ahead on 60 minutes. A clever dinked ball over the West Ham defence from Alexis Mac Allister found Darwin Nunez, who applied a first-time finish for his third league goal of the campaign.
A 19th match at Liverpool without a win as a manager for David Moyes leaves his side in seventh on 10 points.
Mitoma at the double
Roberto De Zerbi brought on Mitoma at half-time and the Japanese scored just 16 seconds after the restart. He exchanged passes with Mahmoud Dahoud before finishing into the far corner from inside the box.
Mitoma wrapped up the win on 77 minutes with a close-range header from Pervis Estupinan's third assist of the season.
It means Bournemouth remain without a win and are 17th, with three points.
Watkins strikes as Chelsea's struggles continue
Villa made their extra man count on 73 minutes. Moussa Diaby played in Watkins, who, despite being forced wide by Levi Colwill, fired in from a narrow angle at the second attempt beyond Robert Sanchez.
Chelsea pressed for an equaliser, but it never came, as they failed to find the back of the net for a third successive league match, taking 45 shots in that time.
A third loss of the season leaves Chelsea 14th, with five points. Villa move up to sixth, with 12 points.