The 2018 Keio Challenger was a professional tennis tournament played on hard courts. It was the thirteenth (ATP) and second (ITF) editions of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Yokohama, Japan between 26 February and 4 March 2018 for the men's edition and between 5 and 11 March 2018 for the women's.

2018 Keio Challenger
Date26 February – 4 March (ATP)
5 – 11 March (ITF)
Edition13th (ATP)
2nd (ITF)
CategoryATP Challenger Tour
ITF Women's Circuit
SurfaceHard
LocationYokohama, Japan
Champions
Men's singles
Japan Yasutaka Uchiyama
Women's singles
Russia Veronika Kudermetova
Men's doubles
Germany Tobias Kamke / Germany Tim Pütz
Women's doubles
United Kingdom Laura Robson / Hungary Fanny Stollár
← 2017 · Keio Challenger · 2019 →

Men's singles main-draw entrants

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Seeds

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Country Player Rank1 Seed
  AUS Jordan Thompson 95 1
  AUS John Millman 103 2
  TPE Jason Jung 153 3
  JPN Go Soeda 156 4
  FRA Stéphane Robert 158 5
  KOR Kwon Soon-woo 180 6
  JPN Tatsuma Ito 181 7
  KOR Lee Duck-hee 190 8
  • 1 Rankings are as of 19 February 2018.

Other entrants

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The following players received wildcards into the singles main draw:

The following player received entry into the singles main draw as a special exempt:

The following players received entry from the qualifying draw:

The following player received entry as a lucky loser:

Women's singles main-draw entrants

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Seeds

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Country Player Rank1 Seed
  JPN Eri Hozumi 180 1
  JPN Junri Namigata 196 2
  JPN Miharu Imanishi 197 3
  ITA Georgia Brescia 202 4
  GBR Laura Robson 218 5
  TUR Ayla Aksu 226 6
  RUS Veronika Kudermetova 227 7
  CHN Lu Jiajing 232 8
  • 1 Rankings are as of 26 February 2018.

Other entrants

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The following players received wildcards into the singles main draw:

The following players received entry from the qualifying draw:

Champions

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Men's singles

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Women's singles

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Men's doubles

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Women's doubles

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