Naomi Osaka advanced to the quarterfinals of the Miami Open for the second year running by beating American Alison Riske 6-3, 6-4 on Monday in the round of 16.
Currently ranked 77th, former world No. 1 Osaka took 92 minutes to dispatch the 50th-ranked Riske and string together just her second three-match winning streak since last year's Miami Open.
"I felt a bit rusty because I haven't played in three days, so (I was) just kind of trying to get back confident and into the groove of things," said Osaka, who received a third-round walkover with the injury withdrawal of Czech Karolina Muchova.
Osaka notched straight-sets wins over Australia's Astra Sharma and Germany's Angelique Kerber, respectively, on her way to the third round in Miami Gardens.
The winner of four Grand Slam titles will face world No. 11 Danielle Collins of the United States in the quarterfinals.
In the men's draw, Japan's Yoshihito Nishioka lost his third-round match against South African Lloyd Harris 7-6(5), 4-6, 7-5.
Related coverage:
Tennis: Osaka beats Kerber to reach 3rd round of Miami Open
Tennis: Naomi Osaka makes winning start in Miami after tears in Indian Wells
Tennis: Naomi Osaka crushed, heckled in 2nd-round Indian Wells defeat
