Naoki Tajima (田島 尚輝, Tajima Naoki, born 21 September 2000) is a Japanese tennis player.

Naoki Tajima
Country (sports) Japan
Born (2000-09-21) 21 September 2000 (age 24)
Kumamoto, Japan
PlaysRight-handed (two-handed backhand)
Prize money$33,406
Singles
Career record0–0
Career titles0
Highest rankingNo. 603 (20 January 2020)
Current rankingNo. 927 (23 May 2022)
Grand Slam singles results
Australian Open Junior1R (2018)
French Open Junior2R (2018)
Wimbledon Junior1R (2018)
US Open JuniorQF (2017)
Doubles
Career record0–0
Career titles0
Highest rankingNo. 427 (21 March 2022)
Current rankingNo. 456 (23 May 2022)
Grand Slam doubles results
Australian Open JuniorQF (2018)
French Open JuniorW (2018)
Wimbledon JuniorSF (2018)
Last updated on: 23 May 2022.

Tajima has a career high ATP singles ranking of 603 achieved on 20 January 2021.

Tajima won the 2018 French Open – Boys' doubles title.

ATP Challenger and ITF Futures finals

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Singles: 2 (0–2)

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Legend
ATP Challenger (0–0)
ITF Futures (0–2)
Finals by surface
Hard (0–1)
Clay (0–1)
Grass (0–0)
Carpet (0–0)
Result W–L    Date    Tournament Tier Surface Opponent Score
Loss 0–1 Jan 2019 M15 Anning, China World Tennis Tour Clay   Agustín Velotti 6–4, 3–6, 5–7
Loss 0–2 May 2021 M15 Kouvola, Finland World Tennis Tour Hard   Anton Matusevich 1–6, 6–4, 0–6

Doubles: 21 (7–14)

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Legend
ATP Challenger (0–0)
ITF Futures (7–14)
Finals by surface
Hard (6–11)
Clay (1–3)
Grass (0–0)
Carpet (0–0)
Result W–L    Date    Tournament Tier Surface Partner Opponents Score
Win 1–0 Jan 2019 M15 Anning, China World Tennis Tour Clay   Kento Takeuchi   Francesco Bessire
  Agustín Velotti
4–6, 7–5, [10–7]
Win 2–0 Apr 2019 M25 Matsuyama, Japan World Tennis Tour Hard   Shinji Hazawa   Cheong-Eui Kim
  Ji Sung Nam
4–6, 6–1, [10–7]
Loss 2–1 Jan 2021 M15 Cairo, Egypt World Tennis Tour Clay   Jose Francisco Vidal Azorin   Franco Agamenone
  Piotr Matuszewski
6–4, 6–7(5–7), [7–10]
Loss 2–2 Apr 2021 M15 St. Petersburg, Russia World Tennis Tour Hard   Alexey Zakharov   Alexandr Cozbinov
  Simon Freund
4–6, 5–7
Loss 2–3 Apr 2021 M15 St. Petersburg, Russia World Tennis Tour Hard   Alexey Zakharov   Alexandr Cozbinov
  Simon Freund
6–75–7, 6–2, [6–10]
Loss 2–4 Oct 2021 M15 Cancún, Mexico World Tennis Tour Hard   Sho Shimabukuro   Siddhant Banthia
  Seita Watanabe
6–1, 4–6, [3–10]
Win 3–4 Oct 2021 M15 Cancún, Mexico World Tennis Tour Hard   Sho Shimabukuro   Peter Bertran
  Mwendwa Mbithi
7–6(7–5), 6–4
Win 4–4 Jan 2022 M15 Monastir, Tunesia World Tennis Tour Hard   Kaito Uesugi   Loic Cloes
  Marat Deviatiarov
(W/O)
Win 5–4 Jan 2022 M15 Monastir, Tunesia World Tennis Tour Hard   Kaito Uesugi   Martin Breysach
  Arthur Bouquier
6–2 7–6(7–5)
Loss 5–5 Feb 2022 M25 Canberra, Australia World Tennis Tour Hard   Calum Puttergill   Rubin Statham
  Akira Santillan
4–6 3–6
Loss 5–6 May 2022 M15 Antalya, Turkey World Tennis Tour Clay   Yuta Shimizu   Juan Pablo Canas Garcia
  Pablo Llamas Ruiz
4–6 5–7
Loss 5–7 Sep 2022 M25 Sapporo, Japan World Tennis Tour Hard   Rimpei Kawakami   Takuto Niki
  Takeru Yuzuki
6–3, 4–6, [8–10]
Loss 5–8 Oct 2022 M25 Kashiwa, Japan World Tennis Tour Hard   Seita Watanabe   Toshihide Matsui
  Kaito Uesugi
3–6, 6–4, [5–10]
Loss 5–9 Jan 2023 M15 Jakarta, Indonesia World Tennis Tour Hard   Keisuke Saitoh   Rivik Choudary Bollipalli
  Niki Kaliyanda Poonacha
1–6, 3–6
Loss 5–10 Feb 2023 M15 Monastir, Tunesia World Tennis Tour Hard   Ryuki Matsuda   Tim Handel
  Yannik Steinegger
4–6, 1–6
Loss 5–11 Jun 2023 M25 Anseong, South Korea World Tennis Tour Clay   Shunsuke Mitsui   Chung Yun-seong
  Takeru Yuzuki
6–7(3–7), 4–6
Win 6–11 Jul 2023 M15 Caloundra, Australia World Tennis Tour Hard   Keisuke Saitoh   Jesse Delaney
  Dayne Kelly
6–3, 6–1
Win 6–12 Oct 2023 M15 Cairns, Australia World Tennis Tour Hard   Kokoro Isomura   Kody Pearson
  Henrik Wiersholm
2–6, 1–6
Win 7–12 Jan 2024 M15 Doha, Qatar World Tennis Tour Hard   Masamichi Imamura   Elliot Benchetrit
  Antoine Ghibaudo
6–2, 6–3
Loss 7–13 Jan 2024 M15 Doha, Qatar World Tennis Tour Hard   Masamichi Imamura   Yanki Erel
  Ergi Kirkin
6–4, 3–6, [2–10]
Loss 7–14 Jun 2024 M15 Anseong, South Korea World Tennis Tour Hard   Ethan Cook   Kenta Miyoshi
  Edward Winter
3–6, 7–5, [6–10]

Junior Grand Slam finals

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Doubles: 1 (1 title)

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Result Year Tournament Surface Partner Opponents Score
Win 2018   French Open Clay   Ondřej Štyler   Ray Ho
  Tseng Chun-hsin
6–4, 6–4
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