Overview
- Hubert Hurkacz beat Taylor Fritz 7-6 (1), 7-6 (2) to give Poland the lead in the semifinal in Sydney.
- Coco Gauff leveled the tie with a 6-4, 6-2 win over Iga Świątek, her fourth straight victory over the world No. 2.
- Katarzyna Kawa and Jan Zieliński defeated Gauff and Christian Harrison 7-6 (5), 7-6 (3) to clinch Poland's 2-1 win, replicating their mixed-doubles decider success from the quarterfinals.
- Switzerland advanced past Belgium 2-1, with Belinda Bencic edging Elise Mertens in singles and pairing with Jakub Paul to win the mixed doubles 6-3, 0-6, 10-5 for the nation’s first United Cup final.
- Bencic remains unbeaten in the event in both singles and mixed doubles, while organizers moved start times due to a severe heatwave with temperatures near 40–43 C.