HEADLINESRybakina out before WTA Finals begin; Kostyuk steps inBurrage receives death threats, abuse on social media after 1st match in 16 monthsRybakina, Sabalenka to lead season-ending WTA Finals groups at Indian WellsNo. 1 Rybakina withdraws from Tokyo quarters with undisclosed injuryRybakina secures No. 1 ranking at Pan Pacific Open, Osaka eliminated
