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Tata Martino has answered every tactical question so far. Can he outwit Carlo Ancelotti?
At the time of writing, Tata Martino can't have done any more to win over Barca's fanatic support.
Doom and gloom enveloped Camp Nou prior to Martino's hire as the return of Tito Vilanova's illness hit the club, still reeling from a knockout blow on the pitch from Bayern Munich for six.
It is to his great credit that we are now talking in terms of this potentially being a vintage year for Barca.
The first silverware of the season in the Supercup against a strong and well-drilled Atletico Madrid side was followed by eight straight La Liga wins, the Blaugrana scoring 28 and letting in just six in the process.
The team has excelled in almost all areas, and despite constant rotation and the occasional system change, the results have been the same.
Real Madrid will present a much more significant test of Barca's resolve and Martino's tactical acumen, but, for now, there is a very different mood in Catalonia.
Carlo Ancelotti had looked to restore an immediate air of calm to a Madrid side that had been beset by internal wranglings, in which previous manager Jose Mourinho was a chief protagonist. In the main, the Italian has succeeded, although the situation with Iker Casillas remains a thorny issue.
Issues with Spain's record-appearance holder aside, Ancelotti is still seeking his best XI and a system that provides Real with more fluidity and ease of transition.
Unlike Barca, Los Blancos have taken time to get going in virtually every match they have played, conceding first in four of their La Liga fixtures. Ronaldo and Isco aside, Los Blancos look a little disjointed with much of their interplay underwhelming.
It's an issue that Ancelotti needs to work on, and quickly, as Barca will fly out of the blocks bouyed by a frenzied home support. A 4-2-3-1 set up should go some way to stifling the Blaugrana attack in those frenetic early stages, reverting to a more attacking 4-3-3 to take the game to Barca in their own backyard as the game progresses.
How well the visitors adapt is likely to dictate whether Ancelotti can stop Martino from making it a "perfect 10."