Mark Chapman introduces highlights from the London derby between Arsenal and Chelsea, as well as Sunday's games featuring Southampton against Tottenham and Swansea versus Everton. Arsenal have started the season superbly, but back-to-back fixtures against Manchester City and now Chelsea will give a clearer indication of whether they can sustain a title challenge. Jose Mourinho was unbeaten against Arsene Wenger heading into this match, and his Chelsea side won 2-0 at the Emirates in the League Cup earlier this season.