Matteo Berrettini faces Andrey Rublev in the fourth round of the U.S. Open on Monday and expects a much tougher challenge from the Russian than he did when they met at the same stage last year.
A trio of mothers kick off their campaigns at Flushing Meadows on Tuesday with former champions Serena Williams and Kim Clijsters in action on day two along with twice runner-up Victoria Azarenka.
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