The four teams who boast a 100 per cent record so far this season
Out of Europe's top leagues, only four teams have managed to win every single game they have played in their respective domestic competitions.
Barcelona
The Catalans have won everything. Betis (2-0), Alavés (0-2), Espanyol (5-0), Getafe (1-2), Eibar (6-1) and Girona (0-3). Six out of six in La Liga.
Napoli
The Italians have also won six games in the Serie A, against Hellas Verona (1-3), Atalanta (3-1), Bologna (0-3), Benevento (6-0), Lazio (1-4) and SPAL (2-3).
Juventus
Juventus top the league table alongside Napoli thanks to wins over Cagliari (3-0), Genoa (2-4), Chievo Verona (3-0), Sassuolo (1-3), Fiorentina (1-0) and Torino (4-0).
Porto
Seven wins for the Portuguese side. Estoril (4-0), Tondela (0-1), Moreirense (3-0), Braga (0-1), Chaves (3-0), Rio Ave (1-2) and Portimonense (5-2) have suffered the blunt of Porto's unstoppable start.