Pegula has now won 15 of 16 matches on the US summer hard court swing which saw a title in Toronto and defeat in the Cincinnati final to Sabalenka.

Eighth seed Veronika Kudermetova claimed her first title of the season and second overall with a comprehensive 7-5 6-1 win over world number four Jessica Pegula in the Pan Pacific Open final in Tokyo on Sunday.

Defending champion Alcaraz, who has only dropped one set on his journey into the last eight, produced a dominant display to overwhelm Italian world No.61 Matteo Arnaldi, winning 6-3, 6-3, 6-4 in 1hr 57min.

American world number four Jessica Pegula said doing business with Saudi Arabia can help the WTA in its quest to ensure equal prize money but it will carefully evaluate following other sports to the Gulf state.

World number eight Daria Kasatkina has given the thumbs down to the idea of "trash-talking" between professional tennis players, saying that disparaging or boastful comments under the guise of banter would not work well in an "intelligent" sport.

Iga Swiatek was left in tears after Jessica Pegula stunned the world number one on Friday to give the United States a 1-0 lead over Poland in the semi-finals of the inaugural United Cup.