Defending champion Elena Rybakina withdrew hours before her opening match at the ATP-WTA Indian Wells Masters on Friday with a gastrointestinal illness. The former Wimbledon champion from Kazakhstan, seeded fourth, had been due to open her campaign with a second-round meeting with Argentina's Nadia Podoroska. She was replaced in the draw by American lucky loser Kayla Day. "It is with great sadness I must announce, I will not be able to participate at this year's Indian Wells tournament due to gastrointestinal issues," Rybakina said in a statement.