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Simona Halep has lost all three of her Grand Slam final matches so far but the Romanian has looked in good form in this tournament.
Halep has won five on her seven encounters with Stephens, including their last meeting at Roland Garros in 2014, but the American has looked in ominous form as she bids to add to her US Open title.
The Men's Doubles final also takes place as second seeds Oliver Marach and Mate Pavic take on French duo Pierre-Hugues Herbert and Nicolas Mahut.
Stage 16, Lovere - Ponte di Legno (194km)
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