Entering the Australian conference derby on Friday night after two straight defeats, the ACT franchise were inspired thanks to a double from hooker Folau Fainga’a.
There were some anxious moments for the Brumbies late in the match as the Waratahs did most of the attacking in the last 20 minutes, but the home side did enough in front of 12,112 fans.
The Brumbies’ second win of the season came in spite of a disastrous start where the Waratahs opened the scoring in bizarre circumstances after five minutes.
But rather than go into their shells following some lacklustre defence, the Brumbies responded by dominating the res t of the first half.
Fainga’a strengthened his Wallabies credentials by crossing the line twice to become the first Brumby since Andrew Walker in 2004 to score a try in five consecutive games.
The Waratahs’ cause wasn’t helped when prop Sekope Kepu was sent to the sin-bin just before the break for a high shot on Brumbies No.8 Lachlan McCaffrey
Waratahs winger Alex Newsome cut the Brumbies 12-5 halftime lead to only two points when he crossed early in the second half.
But the Brumbies received a penalty try a few minutes later, with the Waratahs having another player go to the sin-bin when Harry Johnson-Holmes was yellow carded.
Brumbies coach Dan McKellar said Sio coming off was more precautionary while Valetini will undergo scans.
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The victory was even more impressive considering the Brumbies were without star Wallabies David Pocock and Allan Alaalatoa.
McKellar said the result was built on a determined effort from the Brumbies’ defence.
“It probably wasn’t pretty at times but I think we just stuck at it,” he told reporters.
“We’ve spoken a lot about dealing with pressure and momentum swings and I thought we were outstanding there tonight.”
Waratahs coach Daryl Gibson felt his side could respond well heading into a difficult assignment against the Crusaders next week.
“The Brumbies deserved to win the game, they really capitalised on the pressure they were able to exert,” Gibson said.
“There’s areas in our game that we know if we can fix up we can be very competitive.”
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