Russian-born Daria Kasatkina said she is ready to embrace the "good pressure" of a home Grand Slam when she steps onto the Melbourne Park court as an Australian citizen for the first time.
Jannik Sinner was in ominous form on the Rod Laver Arena court he has ruled for two years before the match was cut short.
Leylah Fernandez earned the biggest win of her career as she beat Anna Kalinskaya in the Washington Open final on Sunday.
But the 29-year-old late bloomer found a way back into the match and rattled off the next four games to book her second-round spot.
Madison Keys fought through a leg injury to beat Jessica Pegula
Images from the US Open women's singles second round matches, at Flushing Meadows, New York, on Wednesday.
Sweltering heat gripped the second-round action at the US Open on Wednesday
IMAGES from Day 1 of the US Open played Flushing Meadows, New York, United States, on Monday.