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Back-to-back won’t come easy. Top-seeded Naomi Osaka began her defense of the U.S. Open title early Tuesday afternoon at Arthur Ashe Stadium with a tense 6-4, 6-7 (5), 6-2 first-round victory over Anna Blinkova of Russia. It was the 21-year-old Osaka’s eighth straight victory in Queens and ran her lifetime record to 12-2 at America’s...