Naomi Osaka walked into the Miami Open fourth round without striking a shot.
The second-seeded Osaka received a walkover into the round of 16 when Serbian qualifier Nina Stojanovic withdrew with a groin injury. Stojanovic was coming off a physical 5-7, 7-5, 6-2 win over 26th-seeded Yulia Putintseva in the second round.
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Osaka advanced to the Miami fourth round for the first time. The four-time Grand Slam champion will face either 16th-seeded Elise Mertens or 22nd-seeded Anett Kontaveit for a quarterfinal spot.
Reigning Australian Open and US Open champion Osaka has not lost a match since the pro circuit resumed last August.
Photo credit: Rob Prezioso/Tennis Australia