The Auckland based side kept the Highlanders try-less in their dominant 35-6 quarter-final win at Eden Park last night.
A red card to Highlanders hooker Andrew Makileo put his side on the back foot from the 22nd minute, but the Southerners were still in the contest at half-time, trailing 14-6.
The Blues outshone the valiant Highlanders in the second half, running in three tries to close out the contest.
Beauden Barrett finished with a brace, while Akira Ioane, AJ Lam and Roger Tuivasa-Sheck all crossed the line for tries of their own.
