Defending champions Jannik Sinner and Madison Keys opened their Australian Open title defenses with hard-fought wins in Melbourne. World No. 2 Sinner advanced after French opponent Hugo Gaston retired after two sets, while Keys recovered from a 4-0 first-set deficit to beat debutante Oleksandra Oliynykova 7-6, 6-1.

For Keys, the victory came on Rod Laver Arena, the same court where she captured her maiden Grand Slam 12 months ago. She admitted to nerves before finding her rhythm. Meanwhile, British hopes dimmed as Katie Boulter lost to in-form Swiss star Belinda Bencic 6-0, 7-5, joining Sonay Kartal in a first-round exit.

Sinner next faces Australian James Duckworth for a spot in the third round. The Italian spoke of his off-season work, saying he tried to become a better player but emphasized enjoying the moment on a packed Grand Slam night session. His path now clears as he looks to defend his 2025 title.