Brumbies coach Jake White admitted that his team did not put in their best performance against the Waratahs and said it was like they had the "jitters".
Despite the Brumbies not putting on their best display the hard fought win over the Waratahs has left them one point shy of sealing top spot of the Australian Super Rugby Conference and a home play off in Canberra.
The Brumbies won 15-19 in front of a healthy crowd at ANZ Stadium by kicking their way to a victory despite being outscored two tries to one.
Head Coach Jake White said that while the Brumbies have played better this year he was thrilled to lead a Brumbies side out of Sydney with a win for the first time since 2002.
"To be honest, we probably didn't play our best rugby, particularly in the first forty minutes," White said.
"I spoke to Kafe (Rod Kafer) at half time and told him it was like we had the jitters during the day."
"I think that's natural playing against 11 Wallabies at a ground that hasn't traditionally held a lot of success for us. That was always going to present challenges.
"But I'm happy with the fight and composure we showed to stick it out and claim another win on the road. "
"All credit to our conditioning staff, we haven't had a point conceded against us in the final 15 minutes for our last nine games."
"Everyone is playing their part, this is why we are involved with rugby."
Two penalties to fly-half Zack Holmes and a long range effort to Jesse Mogg handed the Brumbies a four point lead at half time, with a try to Tatafu Polota-Nau keeping the Tahs in the match at 9-5.
Waratahs No 7 Chris Alcock was in everything, dominating the breakdown, forcing a series of turnovers and causing headaches for the Brumbies. Along with Polota-Nau and Berrick Barnes, Alcock was one of the Waratahs best.
An overlap on the right flank handed Henry Speight his seventh try of the season as he found himself on the end of a lofty pass from Holmes.
And while the Waratahs hit back with a try under the posts to Barnes, the Brumbies ground the finals minutes of play down to claim another four points on the road.