Sabalenka, Medvedev, Musetti, Svitolina and the United Cup finalists headline a packed day across three continents

Previewing the Americans in action tonight, from a Coco-Iga showdown in United Cup, to six other semifinalists in Brisbane, Auckland, and Hong Kong.

The two big-hitters face off in a rematch of their thrilling Australian Open final on Friday.

After shocking Team Canada to advance into the knockout rounds, Elise Mertens and Zizou Bergs will take on another big-name team in the quarterfinals.

Poland needs one win over the Netherlands to advance, while Taylor Fritz and Stefanos Tsitsipas renew a decade-long rivalry.

On a relatively quiet day, Italy and France also try to get on the board against each other.

Plus: Auger-Aliassime and Mboko bid to get Canada off to a winning start against China.

Plus: Alex de Minaur and Casper Ruud begin their seasons with a rare clash, while Belinda Bencic starts building on her 2025 comeback season.

The new season's launch sees Munar and Bouzas-Maneiro look to build on strong campaigns for Spain.

With both chasing a Career Grand Slam, it once again remains to be seen whether anyone is ready to challenge their rule.

Iga Swiatek readies for her first shot at the career Slam in Australia, as Coco Gauff brings a retooled serve to a U.S. title defense.