2025 Keio Challenger – Men's singles

Men's singles
2025 Keio Challenger
Champion Rei Sakamoto
Runner-up 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. Kei Nishikori (quarterfinals)
  2. Rei Sakamoto (champion)
  3. Elias Ymer (first round, retired)
  4. Oliver Crawford (first round)
  5. Hsu Yu-hsiou (first round)
  6. Yuta Shimizu (second round)
  7. Yasutaka Uchiyama (quarterfinals)
  8. Kaichi Uchida (final)

Draw

Key

Finals

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

Top half

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

Bottom half

First round Second round Quarterfinals Semifinals
6 Y Shimizu 6 6
Y Takahashi 2 2 6 Y Shimizu 3 3
K Isomura 5 3 Q Y Kusuhara 6 6
Q Yusuke Kusuhara 7 6 Q Y Kusuhara 3 2
A Santillan 6 6 A Santillan 6 6
WC M Imamura 0 2 A Santillan 6 6
JR K Bigun 3 JR K Bigun 3 1
3 E Ymer 0r A Santillan 6 1 3
7 Y Uchiyama 6 713 2 R Sakamoto 3 6 6
T-h Huang 4 611 7 Y Uchiyama 6 6
Shin Woo-bin 3 3 Q M Vrbenský 3 3
Q M Vrbenský 6 6 7 Y Uchiyama 6 3 4
Maxim Zhukov 6 6 2 R Sakamoto 3 6 6
WC Ryo Tabata 4 4 M Zhukov 1 2
K Samrej 4 61 2 R Sakamoto 6 6
2 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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