PRATI DI TIVO, Italy Italian cyclist Vincenzo Nibali won the toughest stage of the weeklong Tirreno-Adriatico race Sunday with an impressive solo breakaway on the uphill finish, while 40-year-old American Chris Horner retained his overall lead. After Horner accelerated, Nibali made his mover with 4 kilometers (2.5 miles) to go Nibali was…

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