The top-ranked Aussie toppled the former world No.1 6-3 6-4 and never dropped a service point in the win which gave Australia a 1-0 lead in there tie over Spain.

Barty hit 15 winners and six aces in the first set but didn't win a point from Muguruza’s first three service games.

In the second set, she only needed two break point opportunities to take the advantage. 

However, teammate Matt Ebden fell to former world No.3 David Ferrer in his singles match.

The pair came together for the mixed doubles in what was a three-set thriller. Barty and Ebden came from one set down to beat Ferrer and Muguruza 3-4 (3) 4-3 4-3 (3).

In order to reach Saturday's final, Australia will need to beat tournament favourites Germany who boost world No.4 Alexander Zverev and world No.2 Angelique Kerber.

It won't be an easy task for Australia with Keber unbeaten in six singles matches in two years at the Hopman Cup.

Australia has not reached the final of a Hopman Cup since 2016, where Daria Gavrilova and Nick Kyrgios beat Ukraine to lift the trophy.