United Cup action in Sydney does not begin until 3 January (2 January in Perth), but many of the biggest tennis stars in the world have been working hard at Sydney Olympic Park. Alex de Minaur practised with fellow Sydneysider Aleksandar Vukic Tuesday with Team Australia's United Cup captain Lleyton Hewitt watching on. De Minaur has long enjoyed success at the mixed-teams event, where he has defeated Novak Djokovic and Rafael Nadal in the past. Another man he has beaten at the season-opening event is Alexander Zverev, who is also on site and revving up for his 2026 season. The two-time Nitto ATP Finals champion led Germany to United Cup glory in 2024 and will hope to do so again this year beginning with his country's clash on Sunday against the Netherlands. Hubert Hurkacz has been waiting since June to step on court for an ATP Tour match after struggling with a knee injury. 6 again partners Iga Swiatek at the United Cup after falling short in the championship match in two consecutive editions. Maya Joint will try to help carry home hopes inside Ken Rosewall Arena as Australia's No. Joint trained with Mboko on Tuesday and will open her season Saturday against Norway's Malene Helgo. Your data will be used in accordance with the ATP Privacy Policy and WTA Privacy Policy. Get official marketing communications from the ATP and WTA! We'll send you newsletters keeping you informed about news, tournaments, competitions, ticketing, partner offers and more. Your data will be used in accordance with the ATP Privacy Policy and WTA Privacy Policy. No part of this site may be reproduced, stored in a retrieval system or transmitted in any way or by any means (including photocopying, recording or storing it in any medium by electronic means), without the written permission of ATP Tour, Inc..