This weekend's standout Premier League fixture sees Brendan Rodgers' Liverpool side host Jose Mourinho's Chelsea team at Anfield. It was a fixture that played an enormous part in last season's title race, with the Blues running out 2-0 winners to all but gift the championship to Manchester City. There is sure to be an element of revenge in the air from Rodgers and his players, but Mourinho will be completely aware of that, and will not be fazed. It is a hugely important game for the Reds, in particular, who have really struggled for form so far this season. They have only really played well in one league game, away to Tottenham, and if they fail to hit top gear on Saturday they will be picked apart by the current league leaders. The west London side are firing on all cylinders, and remain unbeaten. They look the complete team at present, and it's very difficult to see anyone stopping them from winning a fourth Premier League title. There are even some who feel they might even make a good fist of repeating the heroics of Arsenal's 'Invincibles' side of 2003/04, going the whole season unbeaten. There are sure to be numerous key battles at Anfield on Saturday, and here are five that could determine who comes out on top.