European champions Chelsea defeat Sparta Prague 1-0 in Czech Republic thanks to Oscar . Napoli , second in Serie A , suffer a shock 3-0 home defeat by Czech side Viktoria Plzen . ( CNN ) -- Europa League holders Atletico Madrid suffer a 2-0 home defeat to Russian side Rubin Kazan . - UEFA Champions League:
European champions Chelsea defeat Sparta Prague 1-0 in Czech Republic thanks to Oscar . Napoli , second in Serie A , suffer a shock 3-0 home defeat by Czech side Viktoria Plzen . Europa League holders Atletico Madrid suffer a 2-0 home defeat to Russian side Rubin Kazan . - UEFA Champions League: