The top seed of the Singapore Open, Jessica Pegula, is the latest high-profile player to withdraw from the tournament.
Aryna Sabalenka's angry reaction during the US Open final has earned her a fine.
Elena Rybakina took the mantle as the best player in women's tennis when she defeated outgoing world number one Aryna Sabalenka with a clinical 6-4, 5-7, 6-2 performance in the US Open final on Saturday.
Elena Rybakina has become the world's number one-ranked women's tennis player for the first time in her career after battling past Qinwen Zheng to reach the US Open semi-finals.
Jessica Pegula battled past Emma Navarro to reach the US Open semi-finals, setting up another meeting with defending champion Aryna Sabalenka.
Aryna Sabalenka feared her US Open title defence was slipping away before she produced a dramatic comeback to edge past Linda Noskova in a thrilling quarter-final at Flushing Meadows.