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 | 16-5 | Wataru Inatsu | KO (punches) | ZST 9 - The Battle Field 9 | 1.0 | Tokyo , Japan |
| Loss | 15-5 | Katsuhiko Nagata | Decision (unanimous) | K-1 PREMIUM 2005 Dynamite!! | 2.0 | Osaka , Japan |
| Win | 15-4 | Ramazi Jakharydze | KO (head kick) | Hero's Lithuania 2005 | 1.0 | Vilnius , Lithuania |
| Loss | 14-4 | Hiroyuki Takaya | TKO (punches) | Hero's 3 | 2.0 | Tokyo , Japan |
| Win | 14-3 | Takehiro Murahama | KO (left hook) | Hero's 2 | 1.0 | Tokyo , Japan |
| Win | 13-3 | Danny van Bergen | Submission (armbar) | Shooto Lithuania - Chaosas | 1.0 | Vilnius , Lithuania |
| Win | 12-3 | Masahiro Oishi | KO (punches) | ZST Grand Prix 2 - Final Round, Final | 1.0 | Tokyo , Japan |
| Win | 11-3 | Hirotaka Miyakawa | KO (knee) | ZST Grand Prix 2 - Final Round, Semi Finals | 1.0 | Tokyo , Japan |
| Win | 10-3 | Jakob Shaap | Submission (triangle choke) | Shooto Lithuania - Bushido | 1.0 | Vilnius , Lithuania |
| Win | 9-3 | Boulem Belaini | KO (knee & punches) | ZST Grand Prix 2 - Opening Round | 1.0 | Tokyo , Japan |
| Loss | 8-3 | Naoyuki Kotani | Submission (armbar) | ZST - Battle Hazard 1 | 1.0 | Tokyo , Japan |
| Loss | 8-2 | Hideo Tokoro | Submission (triangle choke) | ZST 5 - The Battle Field 5 | 1.0 | Tokyo , Japan |
| Win | 8-1 | Artemij Sitenkov | Submission (guillotine choke) | Shooto Lithuania - Vendetta | 1.0 | Vilnius , Lithuania |
| Win | 7-1 | Takahiro Uchiyama | KO (punch) | ZST - GT-F | 1.0 | Tokyo , Japan |
| Loss | 6-1 | Marcus Aurélio | Submission (triangle choke) | ZST Grand Prix - Final Round, Semi Finals | 1.0 | Tokyo , Japan |
| Win | 6-0 | Takumi Yano | KO (slam) | ZST Grand Prix - Final Round, Quarter Finals | 1.0 | Tokyo , Japan |
| Win | 5-0 | Menno Dijkstra | KO (knee) | ZST Grand Prix - Opening Round | 1.0 | Tokyo , Japan |
| Win | 4-0 | Atsuhiro Tsuboi | KO (knee) | ZST 4 - The Battle Field 4 | 1.0 | Tokyo , Japan |
| Win | 3-0 | Hideo Tokoro | KO (knees) | ZST 3 - The Battle Field 3 | 1.0 | Tokyo , Japan |
| Win | 2-0 | Atsuhiro Tsuboi | KO (knee) | ZST 2 - The Battle Field 2 | 2.0 | Tokyo , Japan |
| Win | 1-0 | Darius Balulis | Submission (rear-naked choke) | RF 2002 - Vol. 2 | 2.0 | Lithuania |
Question:
Which event led to a 4-0 record?
Answer:
ZST 4 - The Battle Field 4