Casey Dellacqua has helped deliver a Fed Cup victory for Australia on her 33rd birthday, teaming up with Ashleigh Barty to win the deciding doubles match against Ukraine in Canberra on Sunday.

Reigniting their successful doubles combination, veteran Dellacqua and young star Barty took care of Ukraine’s twin sisters Nadiia and Lyudmyla Kichenok to win 6-3 6-4.

Barty was involved in all three victorious rubbers for Australia after winning her singles matches on Saturday and Sunday.

The 3-2 tie victory means Australia moves into the World Group play-offs later this year, putting them one win away from the Fed Cup’s top-eight nations for the first time since 2015.

The tie was pushed into a fifth match after Daria Gavrilova was sensationally upset for the second time in a singles rubber this weekend.

World No.26 Gavrilova went down to the unranked Nadiia Kichenok, who was subbed in by Ukraine captain Mikhail Filima for her twin sister Lyudmyla only minutes before the reverse singles match.

Barty steamrolled teenage sensation Marta Kustyok 6-2 6-3 on Sunday to give Australia a 2-1 lead.

Kostyuk, 15, defeated Gavrilova in straight sets on Saturday, squaring the tie at 1-1 after Barty had survived an early scare against Lyudmyla Kichenok to win 4-6 6-1 6-4.