#2 FC Barcelona (16 games)

The crushing loss to Real Madrid in the Spanish Supercup triggered an avalanche of premonitions of an unmitigated disaster in Barcelona, ahead of the 2017/18 season. But fast forward by a few months, and the tables have startlingly turned and the Catalans find themselves on a fine run. At least in La Liga.
With 16 games played, Ernesto Valverde is yet to taste defeat in the league with his new club, engineering 13 victories in the process. In fact, they are now the only side to still be unbeaten in all competitions since the start of the new domestic season.
That's the extent to which Barcelona have refined since their horror show in the Supercup Clasico.
However, the Catalans will be dealt with their toughest test yet when they travel to the Santiago Bernabeu, where the newly crowned world champions, Real Madrid await. Their amazing run will be put through the wringer then.
Game on.