Wallabies back Mike Harris kicked a penalty from close to the sideline after fulltime to steal a 25-23 victory from Wales in a heart-stopping affair in their Test in Melbourne.
Wales looked to have secured their first win on Australian soil in 43 years but a penalty for collapsing a maul in the final seconds gave replacement Harris the chance for glory.
The visitors showed their trademark fighting spirit at Etihad Stadium but the loss meant a series victory for Australia, who took out the first Test in Brisbane last week.
The lead changed hands nine times as the match went down to the wire.
New dad Berrick Barnes looked to inspire the Wallabies to wrap up the series after making it back to Melbourne just a few hours before kick-off and he was named man of the match.