Naomi Osaka is now in the company of Tyra Banks, Beyoncé and Kate Upton -- the tennis superstar is the newest S.I. Swimsuit cover model!!
The publication made the huge announcement Monday morning ... revealing the 23-year-old would be joining rap star Megan Thee Stallion and transgender actress/model/activist Leyna Bloom as a cover model for the 2021 issue.
The decision was easy for S.I. -- Osaka is no stranger to the suit game (she has her own collection with Frankies Bikinis) .