NOTTINGHAM Forest suffered their first Championship defeat under Stuart Pearce, as they paid the price for some uncharacteristically generous defending.
Cardiff claimed a first victory under new boss Russell Slade, as firstly Federico Macheda and then Peter Whittingham carved out wide open spaces in the Reds defence before finding the back of the net.
Forest did not look like clawing their way back until the final stages, when a late rally had the home side on the back foot. But, while Britt Assombalonga pulled one back in the 89th minute, the visitors could not find a second goal to draw themselves level.
And it was those two goals in the space of five first half minutes that ultimately decided the game, leaving boss Pearce to face his first League loss as Reds boss.
Forest will also head to Watford on Tuesday night without influential midfielder Henri Lansbury, who will be suspended, after collecting his fifth booking of the campaign.
The television cameras had descended on South Wales in the hope of an entertaining contest and, in the opening stages, it looked as though they were going to get one.
Anthony Pilkington forced a slightly awkward but still successful save from Karl Darlow with a driven, powerful 25-yard strike that the Forest keeper managed to push away.
Almost immediately, the Reds – who had named an unchanged side from the one that had drawn 2-2 with Ipswich prior to the international break - hit on the counter and tested David Marshall's reactions, with Matty Fryatt hitting an instant shot that was bound for the bottom corner, until the keeper got down well to push it around the foot of the post.
Forest were forcing a short spell of pressure, with a dangerous cross from Assombalonga cleared from the goal mouth after eluding the grasp of Marshall towards the near post.
When Michail Antonio closed down Bruno Manga on the edge of the box, the winger was able to block his clearance and, for a split second, it looked as though the deflection was bouncing towards goal, but it ended up flying well wide, with Marshall looking on with a little relief.
Chris Burke, the former Cardiff player, demonstrated his threat with a mazy run that took him into a dangerous position on the right, but his cross was well cleared at the near post by Sean Morrison. When Fryatt drove down the centre, it gave Burke another chance to deliver from the right, but Morrison again cleared, at the expense of a corner.
Burke was looking lively and, after leaving two Cardiff players for dead again, he saw a powerful shot beat Marshall, but cleared off the line by Craig Noone.
Less than a minute later, the home side were to take the lead. Federico Macheda was given too much space on the edge of the box, allowing him to carry the ball into the area and slot a simple finish beyond an exposed Darlow and inside the post. It was poor defending from the visitors, who allowed the former Manchester United striker the freedom of Cardiff.
Cardiff's first goal had come in the 22 minute. Their second arrived only five minutes later, as Forest found themselves with a mountain to climb, if they wanted to preserve their unbeaten start to the campaign.
It was Whittingham, a man Forest had pursued for some time earlier in his Cardiff career, who was to inflict the damage, as he engineered the room in which to pull the trigger from the edge of the box. His finish was even more emphatic, as he found the bottom corner with pace and accuracy, leaving Darlow helpless.
Forest suddenly looked shell shocked and nervous, while Cardiff were brimming with confidence. At this point, the priority was for the Reds to make it to half time without conceding again.
Wilson was booked for a clumsy foul as Forest looked to regain some defensive solidity, while Burke and Antonio had swapped flanks, in the run up to the interval, in the hope of carving out an opening at the other end.
But, while the Reds were doing better at holding on to the ball, opportunities were hard to come by. Although Assombalonga might have had a corner when his far post header, from a Jack Hunt cross, seemed to take an obvious deflection.
Referee Michael Jones was making some dubious decisions, with Assombalonga also denied a clear free kick – but the visitors could only have themselves to blame as they went in at half time with a two-goal deficit to close, following some poor defending that was totally out of character for the side that had conceded only two goals in their previous four outings.
Forest began with a sense of purpose after the break, with Antonio trying his luck with a low shot, although it was always well off target after the winger had pulled his effort slightly.
But Darlow had to make a save, in brilliant fashion, to prevent Sean Morrison from extending the home side's lead even further, with a close range header.
After being booked for a late challenge, Lansbury was soon substituted by Forest, with David Vaughan coming on. It was the midfielder's fifth yellow card of the campaign, earning him a one-match ban.
Forest thought, for a split second, that they had pulled a goal back after Antonio had forced a smart reaction save from Marshall, with a crisp shot, but Assombalonga was ruled to be in an offside position when he forced home the loose ball –television replays suggested that it was a marginal, but correct, decision.
That, perhaps, was not a clear, easy decision for the officials to make. But Burke was unlucky not to win a free kick when he had his heels clipped on the edge of the box, as he made dangerous progress.
Forest threw caution to the wind by replacing defender Hunt with striker Lars Veldwijk off the bench, with just less than 14 minutes to play.
Assombalonga did pull a goal back in the 89th minute, driving the ball powerfully into the back of the net after Antonio had done brilliantly to find the room to deliver a cross from the right.
But, amid a bizarre finale that saw Antonio frustrated by Cardiff's refusal to allow him to use the same towel that Aron Gunnarsson had been using to dry the ball ahead of his long throw-ins, Forest could not find a second goal.
Cardiff: Marshall, Brayford, Manga, Whittingham, Le Fondre, Noone, Macheda (Jones 62), Gunnarsson (Adeyemi 66 (Daehli 70)), Pilkington, Ralls, Sean Morrison. Subs: Moore, John, Maynard, Gabbidon.
Forest: Darlow, Hunt (Veldwijk 77), Mancienne, Wilson, Lichaj (Harding 45), Tesche, Burke, Lansbury (Vaughan 57), Antonio, Fryatt, Assombalonga. Subs: de Vries, Veldwijk, Lascelles, Blackstock, Osborn.
Referee: Michael Jones
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