#3 Atletico Madrid (16 games)
They may no longer boast the formidability about themselves after bowing out in the group stages of the UEFA Champions League, but Atletico Madrid do hold an edge in La Liga. After 16 games, Diego Simeone's side still remain unbeaten, registering one of their best ever starts to a campaign.
Despite flashes of shortcomings in almost every other game, Los Rojiblancos have managed to sneak away with desperate wins that have kept their slim title hopes alive. The six draws so far, however, are evidence to their stuttering and erratic vein of form.
It's the quality in their ranks that has proved to be the major difference maker, as the recent game against Alaves might serve to evince.
The ennui of acclimatizing to newer surroundings of Wanda Metropolitano may be one reason. But regardless, they are enjoying a great run. Just six points separate them from leaders Barcelona, as Atletico Madrid remain hot on their heels.