- American comes out on top in three sets, 7-5, 4-6, 6-1
- Both players are making debuts in season-ending tournament
Sloane Stephens came out on top in a match between the two most recent US Open champions. The 2017 champion beat Naomi Osaka 7-5, 4-6, 6-1 on Monday at the WTA Finals, the season-ending tournament for the top eight players in the world.
Both players are making their debut appearances at the tournament, but Stephens was more composed while Osaka, who became the first Japanese player to win a grand slam title last month in New York, never seemed comfortable.