Williams faces Slovenia's Tamara Zidansek, while Federer takes on Serbia's Filip Krajinovic and Djokovic plays Japan's wild card Tatsuma Ito.
The 38-year-old, who is chasing an eighth title in Melbourne, had barely broke sweat against Potapova and admitted air quality remained her biggest concern.bushfires which have ravaged Australia since SeptemberHeavy rain at the beginning of the tournament delivered some much-needed respite to firefighters and significantly improved air quality.
Federer, meanwhile, thrashed the U.S. Steve Johnson 6-3, 6-2, 6-2 in the first round and will face Serbia's Filip Krajinovic on Wednesday. "I trained really hard [between seasons], needed some vacation. I am just so happy I didn't have any setbacks. That sets you up nicely for the season."
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