:2015 Keio Challenger

{{Infobox tennis event|2015|Keio Challenger|

| date=16 November – 22 November

| edition=11th

| surface=Hard

| location=Yokohama, Japan

| champs= {{flagicon|JPN}} Taro Daniel

| champd={{flagicon|THA}} Sanchai Ratiwatana / {{flagicon|THA}} Sonchat Ratiwatana

| after_year=2017

}}

The 2015 Keio Challenger is a professional tennis tournament played on hard courts. It is the eleventh edition of the tournament which is part of the 2015 ATP Challenger Tour. It takes place in Yokohama, Japan between November 16 and November 22, 2015.

Singles main-draw entrants

=Seeds=

class="sortable wikitable"
width="70"| Country

! width="175"| Player

! Rank1

! Seed

{{flag|AUS}}

|John Millman

|91

|1

{{flag|AUS}}

|Matthew Ebden

|107

|2

{{flag|JPN}}

|Tatsuma Ito

|113

|3

style="background:#fcc;"

|{{flag|JPN}}

|Go Soeda

|115

|4

style="background:#cfc;"

|{{flag|JPN}}

|Taro Daniel

|119

|5

{{flag|JPN}}

|Yūichi Sugita

|123

|6

{{flag|RUS}}

|Konstantin Kravchuk

|145

|7

{{flag|JPN}}

|Yoshihito Nishioka

|146

|8

  • 1 Rankings are as of November 9, 2015.

=Other entrants=

The following players received wildcards into the singles main draw:

  • {{flagicon|JPN}} Sora Fukuda
  • {{flagicon|JPN}} Makoto Ochi
  • {{flagicon|JPN}} Masato Shiga
  • {{flagicon|JPN}} Kaito Uesugi

The following players received entry from the qualifying draw:

Champions

=Singles=

{{main|2015 Keio Challenger – Singles}}

=Doubles=

{{main|2015 Keio Challenger – Doubles}}