# 2011 All Japan Indoor Tennis Championships – Singles

Yuichi Sugita was the defending champion after defeating Matthew Ebden in the 2010 final. He was eliminated by Cedrik-Marcel Stebe already in the first round. Stebe reached the final, but lost to Dominik Meffert 6–4, 4–6, 2–6.

## Seeds

* Go Soeda (semifinals)
* Matthias Bachinger (quarterfinals)
* Tatsuma Ito (quarterfinals)
* Yuichi Sugita (first round)
* Dominik Meffert (champion)
* Sebastian Rieschick (quarterfinals)
* Simon Stadler (semifinals)
* Andre Begemann (quarterfinals)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Go Soeda | 4 | 7 | 6$^0$ | | | | | |
| Q | Cedrik-Marcel Stebe | 6 | 6$^4$ | 7 | | | | | |
| Q | Cedrik-Marcel Stebe | 6 | 6$^4$ | 7 | Q | Cedrik-Marcel Stebe | 4 | 6 | 2 |
| | | | | | 5 | Dominik Meffert | 6 | 4 | 6 |
| 7 | Simon Stadler | 1 | 3 | | 5 | Dominik Meffert | 6 | 4 | 6 |
| 5 | Dominik Meffert | 6 | 6 | | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | G Soeda | 7 | 6 | | | | | | | | | | | | | | | |
| | Hiroki Moriya | 5 | 2 | | 1 | G Soeda | 6 | 6 | | | | | | | | | | |
| | D Udomchoke | 6 | 6 | | | D Udomchoke | 2 | 2 | | | | | | | | | | |
| | N Monroe | 4 | 3 | | | | | | | 1 | G Soeda | 6 | 6 | | | | | |
| WC | T Suzuki | 5 | r | | | | | | | 6 | S Rieschick | 2 | 4 | | | | | |
| | H Kondo | 4 | | | | H Kondo | 6 | 4 | 2 | | | | | | | | | |
| | P Oswald | 0 | 4 | | 6 | S Rieschick | 4 | 6 | 6 | | | | | | | | | |
| 6 | S Rieschick | 6 | 6 | | | | | | | | | | | 1 | G Soeda | 0 | 7 | 6$^0$ |
| 4 | Y Sugita | 6 | 1 | 1 | | | | | | | | | | Q | C-M Stebe | 6 | 6$^4$ | 7 |
| Q | C-M Stebe | 3 | 6 | 6 | Q | C-M Stebe | 6 | 6 | | | | | | | | | | |
| WC | Kento Takeuchi | 4 | 4 | | | T Fabbiano | 3 | 1 | | | | | | | | | | |
| | T Fabbiano | 6 | 6 | | | | | | | Q | C-M Stebe | 6 | 6 | | | | | |
| | K Kim | 7 | 7 | | | | | | | 8 | A Begemann | 2 | 4 | | | | | |
| | M Ryderstedt | 6$^5$ | 5 | | | K Kim | 6$^1$ | 6$^6$ | | | | | | | | | | |
| | W-s Jun | 3 | 7 | 6$^4$ | 8 | A Begemann | 7 | 7 | | | | | | | | | | |
| 8 | A Begemann | 6 | 6$^5$ | 7 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | S Stadler | 6 | 6 | | | | | | | | | | | | |
| | G Naso | 4 | 3 | 7 | S Stadler | 6 | 6 | | | | | | | | |
| | T-h Yang | 6$^4$ | 5 | Q | T Fernandes | 0 | 4 | | | | | | | | |
| Q | T Fernandes | 7 | 7 | | | | | 7 | S Stadler | 6 | 7 | | | | |
| | Y-k Lim | 6$^0$ | 4 | | | | | 3 | T Ito | 4 | 6$^3$ | | | | |
| Q | Sho Katayama | 7 | 6 | Q | Sho Katayama | 6$^2$ | 5 | | | | | | | | |
| | C Ebelthite | 3 | 0 | 3 | T Ito | 7 | 7 | | | | | | | | |
| 3 | T Ito | 6 | 6 | | | | | | | | | 7 | S Stadler | 1 | 3 |
| 5 | D Meffert | 6 | 6 | | | | | | | | | 5 | D Meffert | 6 | 6 |
| | V Vardhan | 4 | 4 | 5 | D Meffert | 7 | 6 | | | | | | | | |
| | J Lemke | 4 | 2 | Q | P Gojowczyk | 5 | 3 | | | | | | | | |
| Q | P Gojowczyk | 6 | 6 | | | | | 5 | D Meffert | 6 | 6 | | | | |
| WC | T Matsui | 1 | 4 | | | | | 2 | M Bachinger | 4 | 4 | | | | |
| WC | Y Uchiyama | 6 | 6 | WC | Y Uchiyama | 4 | 3 | | | | | | | | |
| | A Kumantsov | 5 | 0$^r$ | 2 | M Bachinger | 6 | 6 | | | | | | | | |
| 2 | M Bachinger | 7 | 3 | | | | | | | | | | | | |