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Chelsea host Arsenal in the Premier League on Sunday, with the two London clubs level on points after 10 games.
Both Enzo Maresca's Blues and Mikel Arteta's Gunners have won five, drawn three and lost two to sit fourth and fifth in the table respectively.
But, while only goal difference separates the two clubs before they meet at Stamford Bridge, have you noticed which players have outperformed their counterparts?
We've taken a look at the stats for some of Chelsea's and Arsenal's key players - and now it's over to you to work out who has fared better so far this season.