They defeated Jamie Forlis and Jason Kubler of Australia in the final.
The match ended with a score of 6:3, 6:4 in favor of Mladenovic and Dodig.
The duration of the meeting was 1 hour 17 minutes.
Last year, Barbora Kreychikova (Czech Republic) and Nikola Mektic (Croatia) celebrated the victory in the mixed doubles.
Previously, Barty beat the Keys to reach the final of the Ausralian Open.