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No. 1 seeds Barbora Krejcikova and Katerina Siniakova clinched the Australian Open doubles title Sunday, coming from behind to defeat Anna Danilina and Beatriz Haddad Maia 6-7(3), 6-4, 6-4.

The Czech duo’s Australian Open win puts the team one step closer to capturing a career Grand Slam, needing a US Open title to go along with their two French Opens, Wimbledon trophy and Olympic gold medal.

Danilina and Haddad Maia challenged the No. 1 seeds throughout the 2 hour and 42-minute final in the pair’s Grand Slam debut. Firing 22 winners to the Czech team’s 19, the unseeded duo made Krejcikova and Siniakova work, but ultimately couldn’t outlast the champions’ resolve.

“We were fighting hard to get the Australian one,” said Siniakova in the team’s post-match press conference. “So it’s just really exciting and super happy because the focus on the Grand Slam … you want to get these titles, the big ones, so I’m just extremely happy that we got it.”

The Australian Open title marks Krejcikova and Siniakova’s fourth Grand Slam trophy, improving to 4-1 in major finals.