A late try from Chris Feauai-Sautia sealed a 27-17 victory for the Reds over the Brumbies in Canberra.
Feauai-Sautia capitalised on a knock-on with three minutes left to score the try which finally finished off the Brumbies.
Lachie Turner and Aidan Toua had scored first-half tries which gave the Reds a 17-9 lead at half-time, and although the Brumbies got back within touching distance, mistakes cost them at the finish.
Jesse Mogg scored the Brumbies' only try and kicked three penalties, but they could not capitalise on early momentum.
Mogg had already missed one penalty attempt when he gave them the lead with a second in the seventh minute.
Joe Tomane then looked certain to get the first try two minutes later, but Turner made a vital stop for the Reds, and then did the same again moments later to deny Henry Speight.
Nic White doubled the Brumbies lead with another penalty in the 14th minute, but the Reds hit straight back with the game's first try as Quade Cooper sent a long ball out to Turner to cross in the corner.
Cooper's conversion went in off the post, and although he missed a penalty shortly after, Cooper then set up the Reds' second try with a pass to Toua - who used a turn of pace to burn the Brumbies.
Mogg thought he had a try for the Brumbies in the 28th minute, but replays showed Turner had held up the grounding, and instead they had to settle for a penalty.
Cooper replied with one of the Reds in the 32nd minute, and they led 17-9 at the interval.
The Brumbies cut the deficit a little with another Mogg penalty in the 48th minute, only for Cooper to reply moments later, and it was not until Mogg sliced through the Reds defence for a 53rd minute try that they had any real momentum.
Mogg diminished it slightly by missing the conversion but the Brumbies still looked dangerous as they pushed deep into Reds territory.
Making it count was proving more difficult, however, as Mogg missed a 72nd minute penalty which could have brought them within one.
They were still alive, but only for another five minutes.
Cooper went to kick for touch with a 77th minute penalty but failed to find it, only for the Brumbies to knock it on and allow Feauai-Sautia to scoop it up and scamper away.
Cooper nailed the conversion to seal the Brumbies' fate.