Who was the first foreign woman to win a major tennis tournament in the U.S.A.?

Mabel Esmonde Cahill (2 April 1863 – 1 January 1905) was an Irish female tennis player, active in the late 19th century. She was born in the family home of Ballyragget House, Ballyragget, County Kilkenny, the twelfth child of thirteen born into her family. She had 5 sisters and 7 brothers.

Cahill won the Orange Club ladies championship in 1890 and 1891. She became the first foreign woman to win a major tournament when she defeated Ellen Roosevelt in the 1891 US Championships women's final at the Philadelphia Cricket Club. She successfully defended her women's singles title in 1892 and also won the women's doubles title with Adeline McKinlay and the mixed doubles title with Clarence Hobart. She did not defend her titles in 1893.