Katie Boulter and Charles Broom helped Great Britain beat Argentina in their Group F opener of the United Cup.

Great Britain led 1-0 after Boulter beat Nadia Podoroska 6-2 6-3 but Argentina hit back when Tomas Martin Etcheverry overcame a stomach issue to see off Billy Harris 3-6 6-3 6-2.

British number one Boulter and Broom, 26, came through their mixed doubles rubber against Maria Lourdes Carle and Etcheverry 7-6 (7-4) 7-5.

"So thrilled to get the win," Boulter, 28, said.

"Very, very pleased with today. We played so great together considering it was our first time."

Great Britain meet Australia in their next Group F encounter on 1 January. Victory would put them into the quarter-finals in Perth, Australia.

The United Cup began in 2023 with the USA winning the inaugural edition and Germany taking the title in 2024.