Wild card Naomi Osaka defeated Japanese compatriot Misaki Doi in straight sets to claim local bragging rights and advance to the second round of the Pan Pacific Open on Monday.
The big-serving 18-year-old registered a 6-4, 6-4 win in 85 minutes under the closed roof at Ariake Colosseum to set up a meeting with either sixth-seeded Slovak Dominika Cibulkova or Lucie Safarova of the Czech Republic in the next round.
"I think we both played really well but honestly I felt like all the pressure was on Misaki-chan so I didn't have any pressure or anything and I wasn't nervous at all," Osaka said after winning her first career meeting with Doi, Japan's highest-ranked player on the WTA Tour at No. 34.