Cape Town - The Blitzboks are out of the Singapore Sevens having lost 19-17 to Australia in their Cuo quarter-final encounter.
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South Africa led 10-7 at half-time through tries by Siviwe Soyizwapi and Chris Dry and extended their lead to 17-7 with just three minutes to go.
Australia cut the lead to just five points with two minutes remaining thanks to a try by captain Tom Lucas.
A Dylan Sage yellow card didn't help matters and Australia made full use of their numerical advantage with Lachie Anderson getting over the line and John Porch kicking the vital conversion to knock the Blitzboks out of the running.
The Blitzboks will now face Fiji in a match to determine who will fight for fifth place. The match is at 10.26 (SA time).
Upsets continued in the quarter-finals with the USA beating Fiji and Canada downing New Zealand.
Tries: Siviwe Soyizwapi, Chris Dry, Philip Snyman
Conversion: Cecil Afrika
Tries: Tom Lucas, Lachie Anderson, Simon Kennewell
Conversions: Tom Lucas, John Porch