Tense finishes went in the favour of the Crusaders and the Chiefs in Super Rugby Trans-Tasman, while the Blues were emphatic victors.
The Brumbies will go in search of back-to-back Super Rugby AU titles when they face the Reds at Suncorp Stadium next weekend.
A thrilling contest between Western Force and Waratahs was settled in the hosts' favour when Domingo Miotti struck late on.
The Rebels failed to turn dominance into points and were shocked as a late try secured victory for the Western Force on Friday.
Len Ikitau and Andy Muirhead scored twice to set the Brumbies on their way to a 42-14 victory over Western Force on Friday.
Western Force pushed hard for a late comeback but the 14-man Rebels survived to record an important victory.
The Rebels could not make their man advantage count as Ryan Lonergan's heroics off the bench sealed victory for the Super Rugby AU leaders.
Cabous Eloff's late try helped the Rebels edge the Force and reach the Super Rugby AU finals.
The ruthless Brumbies scored five tries to see off Western Force and ensure they will be at home in the final on September 19.
James O'Connor scored a try and kicked 17 points as the Reds achieved a record win over Western Force on Friday.