| 2013 Keio Challenger | |
|---|---|
| Date | 11–17 November |
| Edition | 9th |
| Surface | Hard |
| Location | Yokohama, Japan |
| Champions | |
| Singles | |
 Matthew Ebden | |
| Doubles | |
 Bradley Klahn /  Michael Venus | |
The 2013 Keio Challenger was a professional tennis tournament played on hard courts. It was the ninth edition of the tournament which was part of the 2013 ATP Challenger Tour. It took place in Yokohama, Japan between 11 and 17 November 2013. Mathew Ebden was the tournament champion over Go Soeda.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| AUS | Matthew Ebden | 94 | 1 |
 SLO | Blaž Kavčič | 98 | 2 |
 JPN | Go Soeda | 115 | 3 |
| USA | Bradley Klahn | 118 | 4 |
| AUS | James Duckworth | 132 | 5 |
 FRA | Pierre-Hugues Herbert | 160 | 6 |
| JPN | Yūichi Sugita | 164 | 7 |
| JPN | Tatsuma Ito | 169 | 8 |
The following players received wildcards into the singles main draw:
Borna Ćorić Yoshihito Nishioka Masato Shiga Kaichi Uchida The following players used protected ranking into the singles main draw:
The following players received entry from the qualifying draw:
Chase Buchanan 
Chung Hyeon Shuichi Sekiguchi Yasutaka Uchiyama Matthew Ebden def. Go Soeda 2–6, 7–6(7–3), 6–3 Bradley Klahn / Michael Venus def. 
Sanchai Ratiwatana / Sonchat Ratiwatana 7–5, 6–1