Katie Boulter eases past Germany's Laura Siegemund with a straight sets win to put Great Britain into the Billie Jean King Cup quarter-finals in Malaga.

Iga Swiatek wrapped up a 2-0 victory for Poland over five-time champions Spain to seal their place in the last eight of the Billie Jean King Cup Finals in Malaga. World number two Swiatek beat Spain's Paula Badosa 6-3 6-7 (6-8) 6-1 in the second singles match.

Japan and Slovakia produced stunning comebacks to beat Romania and the United States 2-1, respectively, and reach the quarter-finals of the Billie Jean King Cup on Thursday.

Iga Swiatek beat Paula Badosa in three sets and Poland led Spain by an insurmountable 2-0 in the opening round of the Billie Jean King Cup Finals.

Japan and Slovakia produced stunning comebacks to beat Romania and the United States 2-1, respectively, and reach the quarter-finals of the Billie Jean King Cup on Thursday. Viktoria Hruncakova and Tereza Mihalikova had to dig deep to beat Ashlyn Krueger and Taylor Townsend 6-3 3-6 10-8 in the match tie-break of a thrilling doubles that went into the early hours of Friday.

Ashlyn Krueger and Taylor Townsend saved six match points but ultimately lost the decisive doubles match as the United States was defeated 6-3, 3-6, 10-8 by Slovakia and was eliminated 2-1 in the first round of the Billie Jean King Cup Finals early Friday.

Ashlyn Krueger and Taylor Townsend saved six match points but ultimately lost the decisive doubles match as the United States was defeated 6-3, 3-6, 10-8 by Slovakia and was eliminated 2-1 in the first round of the Billie Jean King Cup Finals early Friday.

Slovakia reach the last eight of the Billie Jean King Cup Finals with a 2-1 victory over 18-time champions the United States.

Shuko Aoyama and Eri Hozumi took Japan into the Billie Jean King Cup quarter-finals for the first time since 2013 on Thursday with a stunning comeback win over Romania. Aoyama and Hozumi defeated Elena-Gabriela Ruse and Monica Niculescu 6-1,