Natsumi Kawaguchi
Natsumi Kawaguchi is a Japanese tennis player.
She has achieved a career-high ITF juniors ranking of 41 in the world.
Kawaguchi and her partner Adrienn Nagy won the 2019 Australian girls' doubles title beating Emma Navarro and Chloe Beck in the finals.
ITF Circuit finals
Singles: 1 (1 title)
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Apr 2019 | ITF Cancún, Mexico | W15 | Hard |  Emily Appleton | 7–6, 6–7, 6–3 |
Doubles: 1 (1 runner–up)
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Dec 2019 | ITF Cancún, Mexico | W15 | Hard |  Nika Kukharchuk |  Madison Appel Elle Christensen | Walkover |