It wasn't the fairytale homecoming that Fernando Torres's wanted, but the Spaniard will have been left very impressed with his new team as they handed Real Madrid their second defeat in a row.
The stakes were high for the first leg of the Copa del Rey round of 16 at the Vicente Calderon, but once Diego Simeone's men were able to prove that they deserve every bit of the respect they've garnered over the last year or so. A second-half penalty courtesy of Raul Garcia gave the home side the initiative, before a classy header from Gimenez sealed the deal.
Atletico 2-0 Real
In truth the first-half was an extremely close affair, with Sergio Ramos forcing a superb save from Atleti goalkeeper Oblak early on. Aside from that however it was a hotly contested affair, with Real looking to bounce back from their momentum-halting loss to Valencia at the Mestalla on Sunday.
It looked as though Ancelotti's charges had gone a goal up virtue of a Gareth Bale header mid-way through the first 45 minutes, but the Wales international had strayed offside before the delivery.
The second-half promised a much more open affair, and those hoping for the record of at least one goal being scored in the Madrid derby for the last 28 games being extended were appeased.
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It was Real's captain, Sergio Ramos, who was at fault for the goal, appearing to drag down Garcia in the area. The referee contemplated for all but a second before pointing to the spot, and Garcia cooly slotted past Keylor Navas into the left-hand corner.
Though Madrid pressed, and a certain Cristiano Ronaldo was introduced, it was to little avail, as Simeone's watertight defensive unit kept them at bay. Gimenez made them pay in the 76th minute, rising above all others to nod home a corner past Navas, who stood no chance.
2-0 the score stands heading into the second leg, but Ancelotti knows there will plenty to do despite the home advantage, if they are to progress now.