SHANGHAI: World number one Elena Rybakina reached the quarterfinals of the Ningbo Open on Thursday on her return from injury when opponent Polina Kudermetova retired. The top seed and defending champion was cruising 5-0 in eastern China when the world number 105 from Uzbekistan called it quits because of injury. Moscow-born Kazakh Rybakina will face Poland’s unseeded Katarzyna Kawa in the last eight. Rybakina, 27, won the US Open for her third Grand Slam crown in September and usurped Aryna
