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Barbora Krejčíková and Kateřina Siniaková were the finalists at the 2021 Australian Open women's doubles. The pair defeated Elise Mertens and Aryna Sabalenka in the final, winning their second Grand Slam title together. Krejčíková and Siniaková have been a dominant force in women's doubles since they first teamed up in 2017.