The first set went to a tiebreak where Bencic, who beat world champion Naomi Osaka in the eighth finals, broke his opponent's serve twice and won 7-5.
On Thursday, Bencic faces the winner between Canadian Bianca Andreescu, ranked 15th in the world, and Belgian Elise Mertens, 26th. One of them will reach his first grand slam final. In the tournament in the United States, a final debutant has been the winner in three of the last four years.
- I dreamed about this as a toddler. Now that I am here, I really enjoy it, said Bencic, whose victory means that she takes place among the top ten in the world for the first time since June 2016.