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Natsumi Kawaguchi
Natsumi Kawaguchi is a professional tennis player from Japan, 24 years old, ranked No. 411 on the WTA singles rankings as of September 21, 2026. Career-high ranking: No. 346 (October 9, 2023). Kawaguchi has won 3 career singles titles from 5 finals (3 at ITF level). Most recent title: W15 Osaka 1 (2023), beating Kuramochi 6-4, 6-1 in the final. In 2026 the record stands at 21-17 (21-17 at ITF / Futures level). Last match: lost to Matsuda 6-4, 6-2 in the QF at W35 Kyoto, September 18, 2026.
The Climb
From the Futures to the Slams
The milestones that mark a professional career, with the ranking at each step.
Call the climb
Say where this player will be, and by when. Graded from the weekly rankings; the record lives on My Slip.
Why we're watching
Recent results
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The last ten singles matches, from the results feed. Click a column header to sort.
Career record by surface
Ranking, recent weeks
Titles & finals
Win–loss by level · this season
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