# Japan at the 1920 Summer Olympics

The Empire of Japan competed at the 1920 Summer Olympics in Antwerp, Belgium.

## Background

Following Japan's poor showing during its Olympic debut at the 1912 Summer Olympics in Stockholm, Sweden, Japan planned for increased participation and the discipline of its athletes in the 1916 Summer Olympics planned for Berlin, Germany (which was subsequently cancelled by World War I. Japan also expanded its participation in international sporting events, by competing in the Far Eastern Games held in Manila in 1913, Shanghai in 1915, Tokyo in 1917 and Manila in 1919. By the time of the 1920 Olympics, Japan was able to field a fifteen-man team. Although most of its track-and-field runners and swimmers failed to pass the initial heats, Japan did considerably better in tennis, securing its first Olympic medals. However, the Japan Amateur Athletic Association, which sponsored the team, grossly underestimated the costs of journey, and was unable to pay for the team's return from Belgium. Local representatives of the Mitsubishi and Mitsui zaibatsu agreed to pay the $15,000 necessary for the stranded team to come home, but the embarrassment was so great that the Japanese government agreed to provide subsidies for future Olympic participation.

## Medalists

| Medal | Name | Sport | Event | Date |
| Silver | Ichiya Kumagae | Tennis | Men's singles | August 23 |
| Silver | Seiichiro Kashio Ichiya Kumagae | Tennis | Men's doubles | August 23 |
Medals by sport :
| Sport | | | | Total |
| Tennis | 0 | 2 | 0 | 3 |
| Total | 0 | 2 | 0 | 2 |

## Aquatics
### Diving

A single diver represented Japan in 1920. It was the nation's debut in the sport. Masayoshi Uchida was unable to advance past the first round of the plain high diving competition.

#### Men

Ranks given are within the semifinal group.
| Diver | Event | Semifinals | Semifinals | Semifinals | Final | Final | Final |
| Diver | Event | Points | Score | Rank | Points | Score | Rank |
| Masayoshi Uchida | Plain high dive | 40 | 94.0 | 8 | did not advance | did not advance | did not advance |

### Swimming

Two swimmers, both men, represented Japan in 1920. It was the nation's debut in the sport. Neither of the swimmers advanced to the finals.
Ranks given are within the heat.

#### Men

| Swimmer | Event | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Final | Final |
| Swimmer | Event | Result | Rank | Result | Rank | Result | Rank |
| Kenkichi Saito | 100 m free | Unknown | 6 | did not advance | did not advance | did not advance | did not advance |
| Kenkichi Saito | 400 m free | 6:16.8 | 2 Q | did not finish | did not finish | did not finish | did not finish |
| Masayoshi Uchida | 100 m free | Unknown | 5 | did not advance | did not advance | did not advance | did not advance |
| Masayoshi Uchida | 400 m free | 6:40.0 | 3 | did not advance | did not advance | did not advance | did not advance |

## Athletics

11 athletes represented Japan in 1920. It was the nation's second appearance in athletics, having competed in the sport both times Japan had appeared at the Olympics. Japan continued to seek its first medals in the sport unsuccessfully, with a 12th-place finish in the decathlon the best result of the Games for Japanese athletes.
Ranks given are within the heat.
| Athlete | Event | Heats | Heats | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Result | Rank | Result | Rank | Result | Rank | Result | Rank |
| Saburo Hasumi | 800 m | N/A | N/A | 2:02.2 | 6 | did not advance | did not advance | did not advance | did not advance |
| Saburo Hasumi | 1500 m | N/A | N/A | N/A | N/A | | 6 | did not advance | did not advance |
| Ichiro Kaga | 100 m | | 5 | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance |
| Ichiro Kaga | 200 m | | 4 | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance |
| Shizo Kanakuri | Marathon | N/A | N/A | N/A | N/A | N/A | N/A | 2:48:45.4 | 16 |
| Hiroshi Masuda | Pentathlon | N/A | N/A | N/A | N/A | N/A | N/A | did not finish | did not finish |
| Yahei Miura | Marathon | N/A | N/A | N/A | N/A | N/A | N/A | 2:59:37.0 | 24 |
| Zensaku Motegi | 10000 m | N/A | N/A | N/A | N/A | | 12 | did not advance | did not advance |
| Zensaku Motegi | Marathon | N/A | N/A | N/A | N/A | N/A | N/A | 2:51:09.4 | 20 |
| Gensabulo Noguchi | Decathlon | N/A | N/A | N/A | N/A | N/A | N/A | 3668.630 | 12 |
| Tomeichi Oura | 5000 m | N/A | N/A | N/A | N/A | | 6 | did not advance | did not advance |
| Kunosuke Sano | 5000 m | N/A | N/A | N/A | N/A | | 7 | did not advance | did not advance |
| Kunosuke Sano | 10000 m | N/A | N/A | N/A | N/A | | 8 | did not advance | did not advance |
| Shinichi Yamaoka | 100 m | 11.6 | 4 | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance |
| Shinichi Yamaoka | 200 m | 23.9 | 4 | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance |
| Kenzo Yashima | Marathon | N/A | N/A | N/A | N/A | N/A | N/A | 2:57:02.0 | 21 |

## Tennis

Two tennis players, both men, competed for Japan in 1920. It was the nation's debut in the sport. Kumagae took the men's singles silver medal, and the pair also took silver in the men's doubles. The two would have faced each other in the quarterfinals of the singles tournament had Kashio advanced that far, so could not have won any more than the two medals they did win.
| Player | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Finals | Rank |
| Player | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Seiichiro Kashio | Men's singles | Bye | Tegner (DEN) W 6–3, 6–1, 6–2 | Dodd (RSA) L 6–3, 4–6, 6–2, 3–6, 6–1 | did not advance | did not advance | did not advance | 9 |
| Ichiya Kumagae | Men's singles | Alonso (ESP) W 7–5, 6–3, 6–3 | de Laveleye (BEL) W 6–0, 6–1, 6–0 | Lammens (BEL) W 7–5, 6–1, 6–4 | Dodd (RSA) W 7–5, 6–1, 6–1 | Winslow (RSA) W 6–2, 6–2, 6–2 | Raymond (RSA) L 5–7, 6–4, 7–5, 6–4 | |
| Seiichiro Kashio Ichiya Kumagae | Men's doubles | N/A | Bye | Lammens & Washer (BEL) W 6–1, 6–4, 6–4 | Norton & Raymond (RSA) W 6–3, 6–2, 4–6, 6–3 | Blanchy & Brugnon (FRA) W 6–4, 4–6, 6–3, 6–1 | Turnbull & Woosnam (GBR) L 6–2, 5–7, 7–5, 7–5 | |
| Opponent nation | Wins | Losses | Percent |
| Belgium | 3 | 0 | 1.000 |
| Denmark | 1 | 0 | 1.000 |
| France | 1 | 0 | 1.000 |
| Great Britain | 0 | 1 | .000 |
| South Africa | 3 | 2 | .600 |
| Spain | 1 | 0 | 1.000 |
| Total | 9 | 3 | .750 |
| Round | Wins | Losses | Percent |
| Round of 64 | 1 | 0 | 1.000 |
| Round of 32 | 2 | 0 | 1.000 |
| Round of 16 | 2 | 1 | .667 |
| Quarterfinals | 2 | 0 | 1.000 |
| Semifinals | 2 | 0 | 1.000 |
| Final | 0 | 2 | .000 |
| Bronze match | 0 | 0 | – |
| Total | 9 | 3 | .750 |