Seeds • 1 Rankings are as of 28 October 2019.
Other entrants The following players received wildcards into the singles main draw: •
Shinji Hazawa •
Taisei Ichikawa • Yuki Mochizuki • Ryota Tanuma •
Seita Watanabe The following player received entry into the singles main draw using a protected ranking: •
Bradley Mousley The following players received entry into the singles main draw as alternates: • Ken Onishi • Takashi Saito The following players received entry from the qualifying draw: • Yuta Kawahashi •
Timur Khabibulin The following players received entry as lucky losers: • Ren Nakamura • Kazuki Nishiwaki ==Champions==