Four-time major champion Naomi Osaka and World No. 1 Aryna Sabalenka headline the women's competition, while World No. 1 Jannik Sinner, Alexander Zverev and Americans Taylor Fritz

Naomi Osaka ’s return to Grand Slam competition ended prematurely on Friday, as the two-time Australian Open champion was forced to retire from her third-round match against Belinda Bencic due to a strained abdominal muscle. Osaka had dropped the opening set in a tiebreaker, 7-6 (3), before informing the chair umpire she could no longer continue.

LAS VEGAS — Top-ranked Jannik Sinner will face No. 2 Alexander Zverev and women’s No. 1 Aryna Sabalenka will play former No. 1 Naomi Osaka in exhibition matches March 1-2 in Las Vegas.

Four men — top-ranked Jannik Sinner of Italy ... Two women — No. 1 Aryna Sabalenka of Belarus and former No. 1 Naomi Osaka of Japan — also are expected to compete. Tickets go on sale ...

Australian Open top seed and defending champion Jannik Sinner beat Marcos Giron with the minimum of fuss at Rod Laver Arena on Saturday.

Four-time major champion Naomi Osaka and World No. 1 Aryna Sabalenka headline the women's competition, while World No. 1 Jannik Sinner, Alexander Zverev and Americans Taylor Fritz and Tommy Paul ...