Zverev and Swiatek headline United Cup 2025 The third edition of the United Cup serves as the season-opener for the ATP Tour and WTA Tour – the only event apart from the four Grand Slams where mixed doubles is officially played GROUP STAGE: Dec 27-Jan 1 Winners and best runner-up from each host city advance to Quarter-finals GROUP A USA Canada Croatia Perth GROUP B Poland Czechia Norway Sydney GROUP C Greece Kazakhstan Spain Perth GROUP D Italy France Switzerland Sydney GROUP E China Germany Brazil Perth GROUP F Great Britain Australia Argentina Sydney Format: One men’s and one women’s singles match, and one mixed doubles, per tie 2024 champions: Germany All start times local to host venue 27 Kazakhstan - Spain China - Brazil 28 Canada - Croatia Greece - Spain France - Switzerland Australia - Argentina 29 USA - Canada Czechia - Norway Italy - Switzerland Germany - Brazil 30 Poland - Norway Greece - Kazakhstan China - Germany G.Britain - Argentina 31 USA - Croatia Italy - France 1 Poland - Czechia G.Britain - Australia QUARTER-FINALS Jan Venue C1 - E1, Perth A1 - Perth 2nd, Perth B1 - Sydney 2nd, Sydney D1 - F1, Sydney SEMI-FINALS W1 - W3, Sydney W2 - W4, Sydney FINAL Ken Rosewall Arena, Sydney CLASS OF 2025 Five of world’s Top 10 women players and five of Top 12 men are set to feature in 2025 tournament Iga Swiatek POL Coco Gauff USA Taylor Fritz USA Elena Rybakina KAZ Casper Ruud NOR Alex de Minaur AUS Alexander Zverev GER Qinwen Zheng CHN Jasmine Paolini ITA Stefanos Tsitsipas GRE 11 Source: United Cup *Singles rank as of Dec 16 Pictures: Getty Images © GRAPHIC NEWS