Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Res. | Record | Opponent | Method | Event | Round | Location |
| --- | --- | --- | --- | --- | --- | --- |
| Win | 20-8 | Giovani Diniz | TKO (punches) | Shooto - 5th Round | 1 | Tokyo , Japan |
| Win | 19-8 | Kotetsu Boku | Decision (unanimous) | Shooto - Shootor's Legacy 3 | 3 | Osaka , Japan |
| Win | 18-8 | Takashi Nakakura | Decision (unanimous) | Shooto - Shooto Tradition 2011 | 3 | Osaka , Japan |
| Win | 17-8 | Kiyonobu Nishikata | Submission (rear-naked choke) | GCM - Demolition West in Yamaguchi 2 | 1 | Osaka , Japan |
| Loss | 16-8 | Satoru Kitaoka | Submission (guillotine choke) | Pancrase - Passion Tour 9 | 2 | Tokyo , Japan |
| Loss | 16-7 | Katsunori Kikuno | KO (punch) | DREAM.13 | 1 | Yokohama , Japan |
| Win | 16-6 | Won Sik Park | TKO (corner stoppage) | Dream 12 | 1 | Osaka , Japan |
| Win | 15-6 | Yoshihiro Koyama | TKO (punches) | Cage Force | 1 | Tokyo , Japan |
| Win | 14-6 | Katsuhiko Nagata | TKO (punches) | Cage Force | 1 | Tokyo , Japan |
| Win | 13-6 | Naoyuki Kotani | Submission (reverse full-nelson) | ZST | 2 | Tokyo , Japan |
| Loss | 12-6 | Hayato Sakurai | Decision (unanimous) | Dream 6 | 2 | Saitama, Saitama , Japan |
| Win | 12-5 | Motoki Miyazawa | TKO (cut) | Dream 5 | 1 | Osaka , Japan |
| Loss | 11-5 | Jonathan Goulet | TKO (punches) | UFC 83 | 2 | Montreal, Quebec , Canada |
| Loss | 11-4 | Thiago Alves | TKO (strikes) | UFC Fight Night 11 | 2 | Nevada , United States |
| Win | 11-3 | Forrest Petz | Decision (unanimous) | UFC Fight Night 9 | 3 | Nevada , United States |
| Loss | 10-3 | Jon Fitch | Decision (unanimous) | UFC 64 | 3 | Nevada , United States |
| Win | 10-2 | Renato Verissimo | TKO (strikes) | ROTR 9 - Rumble on the Rock 9 | 2 | Hawaii , United States |
| Win | 9-2 | Ryan Schultz | Submission (armbar) | MARS - MARS | 2 | Tokyo , Japan |
| Win | 8-2 | Takuya Wada | Submission (triangle choke) | GCM - D.O.G. 4 | 1 | Tokyo , Japan |
| Loss | 7-2 | Shinya Aoki | TKO (cut) | Shooto 2005 - 11/6 in Korakuen Hall | 1 | Tokyo , Japan |
| Win | 7-1 | Ramunas Komas | Decision | Shooto Lithuania - Bushido | N/A | Lithuania |
| Win | 6-1 | Mark Moreno | Submission (neck crank) | SB 29 - SuperBrawl 29 | 1 | Hawaii , United States |
| Win | 5-1 | Nick Diaz | Decision (split) | Shooto - 2002 Year-End Show | 3 | Tokyo , Japan |
| Win | 4-1 | Yasuyuki Tokuoka | Decision (unanimous) | Shooto - Treasure Hunt 11 | 2 | Tokyo , Japan |
| Win | 3-1 | Yuji Kusu | TKO (swollen eye) | Shooto - GIG East 10 | 2 | Tokyo , Japan |
| Loss | 2-1 | Hirofumi Hara | TKO (punches) | Shooto - GIG East 9 | 1 | Tokyo , Japan |
| Win | 2-0 | Toru Nakayama | Submission (triangle choke) | Shooto - Treasure Hunt 4 | 1 | Tokyo , Japan |
| Win | 1-0 | Takayuki Okochi | Decision (unanimous) | Shooto - GIG East 6 | 2 | Tokyo , Japan |
Question:
What is Opponent, when Location is "Tokyo , Japan", when Method is "Decision (unanimous)", and when Record is "4-1"?
Answer:
Yasuyuki Tokuoka