Napoli dropped two precious points in the Serie A title race in a tightly-contested 3-3 draw with Udinese, while Mario Balotelli scored a brace in AC Milan's 2-2 away draw at Livorno.
Fiorentina dominated ten-man Verona 4-3 in a seven-goal thriller that produced four goals inside the opening quarter hour at the Stadio Artemio Franchi, while Napoli beat Lazio 4-2 on the road.
Juventus moved to within two points of Roma with a 3-2 victory over an injury-plagued AC Milan side, while Napoli also kept the pressure on the Serie A leaders with a 4-0 win over Livorno.
Matchday 2 of the group phase of the UEFA Champions League promises to be a thrilling one, featuring no fewer than six matches between teams who won their opening games.
Napoli earned three points with a 2-0 win at Genoa on the back of a Goran Pandev brace, sending Rafael Benitez's men to the top of the Serie A table, while AC Milan also notched a victory Saturday, edging Sampdoria 1-0.
Goals from frenchmen Olivier Giroud and Laurent Koscielny rescued Arsenal against Napoli to draw 2-2 while Galatasaray beat Porto in the opening matches of the 2013 Emirates Cup.