#1: FC Barcelona

The most successful club in the history of the Copa del Rey, Barca have won the Copa a remarkable 29 times. Believed to have a monopoly over the Cup, the Blaugrana have won the trophy for the last three seasons.
Under new manager Ernesto Valverde, Barcelona looks more promising than last season. With an in-form Leo Messi and stability in midfield, the Blaugrana have been unbeaten, so far, in the season.
A squad depth fancied by many, first-choice Barcelona players would be relieved of fatigue as Ernesto Valverde has a hoard of players at his disposal, who can be inspirational off-the-bench whenever given the chance.
Speculated to only improve their midfield in the winter transfer window, Barcelona is unarguably one of the strongest team in all of Europe ever since the new season began.
Scoring a massive number of goals and surprisingly conceding only two, Barcelona have found an answer to their defensive lapses. Portuguese Nelson Semedo occupies the right-back spot for the team while left-back Jordi Alba has been benefited from Ernesto Valverde's tactical changes.
In-form fullbacks complement the tested defensive duo of Pique and Umtiti which stands strongly behind an experienced Barcelona midfield of Busquets, Iniesta, and Rakitic.
Messi's and Co. would be fan-favourites to retain the Cup and the pint-sized Argentine could be the telling difference for the title, like he has been all these years.