#6 Sergio Aguero vs David Luiz
City's all-time record goalscorer against a David Luiz seeking redemption at Chelsea, the 31-year-old Brazilian international fell out of favour with Antonio Conte last season and found himself frozen out of the first team by the Italian manager. However, Sarri seems to have given him a clean slate, and it is one which the moppy-haired centre-back would do well to utilize.
Sergio Aguero represents the chief goal threat for Manchester City and has been the club's leading goalscorer every season since his arrival from Atletico Madrid in 2011.
He is coming off the back of a very disappointing World Cup campaign with La Albiceleste of Argentina and would be in a determined mood to get that behind him as soon as possible in the only way he knows how; by scoring goals.
Aguero is one of the most lethal centre-forwards in Europe, and if Chelsea are to have a good chance of victory against Manchester City, his impact would have to be nullified, with David Luiz having a huge role to play in nullifying that threat.