She was defeated by Carina Damm in a controversial bout at MARS Attack 1 on July 21, 2006, but avenged the loss in a rematch one month later on August 26. Matsumoto became the number one contender in DEEP after back-to-back wins over Seo Hee Ham and Misaki Takimoto in their third meeting. She captured the DEEP Women's Lightweight Championship by defeating Hisae Watanabe at DEEP: 31st Impact on August 5, 2007.
Matsumoto
Misaki Takimoto