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2025 Keio Challenger – Men's singles

Men's singles
2025 Keio Challenger
ChampionJapan Rei Sakamoto
Runner-upJapan Kaichi Uchida
Score4–6, 7–6(7–4), 6–4
Main article: 2025 Keio Challenger

Yuta Shimizu was the defending champion[1] but lost in the second round to Yusuke Kusuhara.

Rei Sakamoto won the title after defeating Kaichi Uchida 4–6, 7–6(7–4), 6–4 in the final.[2]

Seeds

  1. Japan Kei Nishikori (quarterfinals)
  2. Japan Rei Sakamoto (champion)
  3. Sweden Elias Ymer (first round, retired)
  4. United Kingdom Oliver Crawford (first round)
  5. Chinese Taipei Hsu Yu-hsiou (first round)
  6. Japan Yuta Shimizu (second round)
  7. Japan Yasutaka Uchiyama (quarterfinals)
  8. Japan Kaichi Uchida (final)

Draw

Key

Finals

Semifinals Final
          
8 Japan Kaichi Uchida 6 6
Q Brazil Igor Marcondes 4 2
8 Japan Kaichi Uchida 6 64 4
2 Japan Rei Sakamoto 4 77 6
Japan Akira Santillan 6 1 3
2 Japan Rei Sakamoto 3 6 6

Top half

First round Second round Quarterfinals Semifinals
1 Japan K Nishikori 4 6 6
Q Japan T Ichikawa 6 1 1 1 Japan K Nishikori 6 6
WC Japan Lennon Roark Jones 6 1 2 South Korea S-h Shin 4 1
South Korea Shin San-hui 3 6 6 1 Japan K Nishikori 2 2
Thailand M Jones 63 2 8 Japan K Uchida 6 6
Q Japan Ryotaro Taguchi 77 6 Q Japan R Taguchi 5 4
South Korea H Chung 3 0 8 Japan K Uchida 7 6
8 Japan K Uchida 6 6 8 Japan K Uchida 6 6
4 United Kingdom O Crawford 4 4 Q Brazil I Marcondes 4 2
Q Brazil I Marcondes 6 6 Q Brazil I Marcondes 6 77
Q Japan Jumpei Yamasaki 4 65 Japan Y Mochizuki 2 65
Japan Yuki Mochizuki 6 77 Q Brazil I Marcondes 6 6
United Kingdom Max Basing 6 2 3 Austria N Oberleitner 1 3
Japan Hikaru Shiraishi 2 6 6 Japan H Shiraishi 5 6 3
Austria N Oberleitner 7 6 Austria N Oberleitner 7 4 6
5 Chinese Taipei Y-h Hsu 5 2

Bottom half

First round Second round Quarterfinals Semifinals
6 Japan Y Shimizu 6 6
Japan Y Takahashi 2 2 6 Japan Y Shimizu 3 3
Japan K Isomura 5 3 Q Japan Y Kusuhara 6 6
Q Japan Y Kusuhara 7 6 Q Japan Y Kusuhara 3 2
Japan A Santillan 6 6 Japan A Santillan 6 6
WC Japan M Imamura 0 2 Japan A Santillan 6 6
JR United States K Bigun 3 JR United States K Bigun 3 1
3 Sweden E Ymer 0r Japan A Santillan 6 1 3
7 Japan Y Uchiyama 6 713 2 Japan R Sakamoto 3 6 6
Chinese Taipei T-h Huang 4 611 7 Japan Y Uchiyama 6 6
South Korea Shin Woo-bin 3 3 Q Czech Republic M Vrbenský 3 3
Q Czech Republic M Vrbenský 6 6 7 Japan Y Uchiyama 6 3 4
Maxim Zhukov 6 6 2 Japan R Sakamoto 3 6 6
WC Japan Ryo Tabata 4 4 M Zhukov 1 2
Thailand K Samrej 4 61 2 Japan R Sakamoto 6 6
2 Japan R Sakamoto 6 77

References

  1. ^ Heer, Florian (November 30, 2023). "Watanuki Wins Yokohama Keio Challenger".
  2. ^ "Sakamoto Secures Yokohama Keio Challenger Crown". tennistourtalk.com. Retrieved 23 November 2025.
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