New Juventus signing Diego stole the show in only his second Serie A start with two stunning goals in a 3-1 win at AS Roma Sunday. The Brazilian playmaker, signed from Werder Bremen in the close season, demonstrated why Juve fans hope he is the missing link to bridge the gap with champions Inter Milan this term. “It's thanks to the environment at Juve, coach Ciro Ferrara, my team mates and the fans that I've settled in so well,” Diego said. Having produced flashes of brilliance in last weekend's 1-0 win over Chievo in Juve's league opener, Diego netted his first competitive goal for the club midway through the first half. A mistake by defender Marco Cassetti allowed Diego to charge towards goal from the halfway line before outmuscling John Arne Riise in the box and scoring with the outside of his boot. Roma's Daniele De Rossi equalised for the hosts 10 minutes later and although different, his goal was equally breathtaking. With Juve debutant Felipe Melo busy arguing with the referee, Roma took a quick free kick and Italy midfielder De Rossi unleashed a dipping 30-meter strike which caught goalkeeper Gianluigi Buffon slightly unawares. Diego was not to be outdone, however, and he ran on to Vincenzo Iaquinta's clever flick in the second half and bamboozled the Roma defence before rifling home. Fellow Brazilian Felipe Melo sealed Roma's second league defeat with a fierce strike in injury time having struggled for much of the match. Juve, which again left Alessandro Del Piero on the bench and hope to sign Lyon's Fabio Grosso Monday, had a number of other good chances with Amauri striking a post. In other games Sunday, Roberto Donadoni's Napoli beat his former side Livorno 3-1 with new signing Fabio Quagliarella scoring his first two goals for his hometown club. Fiorentina defeated Palermo 1-0 on a terrible pitch in Florence thanks to Stevan Jovetic's clever flick, while Sampdoria overcame Udinese 3-1, promoted Parma edged past Catania 2-1 and Genoa won 1-0 at Atalanta. Former Inter striker Julio Cruz scored a penalty and tapped in to give Lazio a 2-1 victory at Chievo and Siena were 3-1 winners at Cagliari. Inter hammered 10-man AC Milan 4-0 in Saturday's derby. Valencia downs Sevilla Juan Mata's clinical strike and a lucky finish from Pablo Hernandez gave Valencia a 2-0 win over 10-man Sevilla in their opening La Liga match of the season Sunday. Atletico Madrid's campaign got off to a poor start earlier when it was thrashed 3-0 at Malaga. Villarreal squandered a 1-0 lead at Osasuna to draw 1-1, while promoted Xerez lost 2-0 at Real Mallorca and had two players sent off in their first match in Spain's top flight. Athletic Bilbao beat visiting Espanyol 1-0 and Roberto Soldado netted three to propel Getafe to a 4-1 win at Racing Santander. Real Valladolid managed to hang on for a 0-0 draw at Almeria. Barca's opening match of the season against Sporting Gijon has been put back to Monday due to the Spanish and European champions' European Super Cup match against Shakhtar Donetsk Friday, which it won 1-0. Hamburg on top Paolo Guerrero scored twice as Hamburg SV went top of the Bundesliga with a 3-1 win over Cologne Sunday. Werder Bremen moved up to third when Brazilian defender Naldo gave it a 3-2 win at Hertha Berlin in the day's other game.