Atalanta BC secured a stunning 2-1 victory over Chelsea FC to kick-start their UEFA Champions League campaign. Ruslan Malinovsky's 27th-minute opener and Luis Muriel's second-half strike sealed the win for Atalanta, while a late header from Nicolas Nkoulou was not enough for Chelsea to rescue a point. The result marks a significant upset, with Atalanta now poised to claim the top spot in Group G.