Japan's tennis player Naomi Osaka speaks during a press conference ahead of WTA Finals in Singapore, Saturday, Oct. 20, 2018. U.S. Open champion Osaka was drawn in the same group as Angelique Kerber, Sloane Stephens and Kiki Bertens for her debut appearance at the WTA Finals. (Kyodo News via AP)

SINGAPORE (AP) Naomi Osaka and Sloane Stephens, the last two U.S. Open champions, will make their career debuts at the WTA Finals by playing each other in their first match in Singapore on Monday.

The initial stage of the eight-player WTA Finals field is a round-robin competition with two teams of four players. The two players with the best record from each round-robin group advance to next Saturday's semifinals.

It's been a whirlwind six weeks for Osaka, a dual Japanese-American citizen who plays under the Japanese flag, since winning the U.S. Open.

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