Serena Willams will be looking to win her 24th Grand Slam title at the US Open this year.
The US Open will lack both reigning champions in Rafael Nadal and Canada's Bianca Andreescu.
Bianca Andreescu was billed as the top-seed in Auckland WTA Classic but she has been forced out by "ongoing knee issues", tournament organisers said.
WTA Finals: Simona Halep moved on top of Purple Group alongside defending champion Elina Svitolina who earlier beat No.2 seed Karolina Pliskova.
China Open: Naomi Osaka said that she felt she had been "counted out" after hitting poor form following her Australian Open triumph in January.
Eugenie Bouchard had gone on a blind date after losing a Super Bowl bet in 2017.
Bianca Andreescu tweeted a picture of her posing with a customised WWE belt and wrote: "Thank you WWE for the gift! Who trynna square up?"