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Naomi Osaka Upset by Hsieh Su-Wei in Third Round of Miami Open

MIAMI GARDENS, Fla. — The new site for the Miami Open suddenly is missing a lot of star power.

Serena Williams withdrew Saturday, blaming a previously undisclosed left knee injury. Less than two hours later, top-ranked Naomi Osaka lost in the third round to tour veteran Hsieh Su-Wei of Taiwan, 4-6, 7-6 (4), 6-3.

Osaka's departure matched the earliest ever in the tournament by a top-seeded woman and jeopardized her No. 1 ranking, depending on results next week.

''I feel like I've dealt with the stress of people asking me 'do I have pressure because I have the No.