Elena Rybakina clinches year-end top ranking with straight-sets win over Yulia Putintseva. Elena Rybakina pulled out of the Pan Pacific Open in Tokyo on Friday because of a neck injury, one day after she locked in the year-end world number one ranking. The 27-year-old Moscow-born Kazakh had been scheduled to face Canada’s Leylah Fernandez in the quarterfinals.