Inter Milan failed to take advantage of Juventus' defeat to AC Milan yesterday as they fell to a 1-0 defeat at Parma.
Lionel Messi, Cristiano Ronaldo and Walter Samuel all enjoyed derbies to remember this week, while runs ended for both River Plate and Brad Friedel, and Seattle Sounders' fans created a new club record.
Napoli and Juventus remain locked together at the top of Serie A after winning their respective games against Udinese and Siena respectively.
Andrea Stramaccioni's first game as Inter Milan coach featured nine goals, four penalties and two red cards as I Nerazzurri eventually edged out Genoa 5-4 at the San Siro.
A late pair of Argentinian goals, from the heads of Walter Samuel and Diego Milito, were enough to stun Chievo and claim a 2-0 win for Inter Milan, lifting some of the pressure on coach Claudio Ranieri.
Chelsea and Inter Milan will both need to keep their nerve on the road in the UEFA Champions League this week, while giants Real Madrid and Bayern Munich are also in action.