Table:
text: Rumina Sato
Mixed martial arts record
Mixed martial arts record
Res_ Record Opponent Round Time_ Location_
Win 18–4–1 Marcio Ramos Barbosa 3 5:00 Osaka , Japan
Loss 17–4–1 Caol Uno 1 2:21 Chiba , Japan
Win 17–3–1 Takuya Kuwabara 2 5:00 Kanagawa , Japan
Win 16–3–1 Yves Edwards 1 0:18 Honolulu, Hawaii , United States
Win 15–3–1 Rafael Cordeiro 1 0:58 Chiba , Japan
Win 14–3–1 Phil Johns 1 0:54 Osaka , Japan
Loss 13–3–1 Caol Uno 3 4:02 Yokohama , Japan
Win 13–2–1 Charles Diaz 1 0:06 Tokyo , Japan
Loss 12–2–1 André Pederneiras 1 4:20 Chiba , Japan
Win 12–1–1 Michael Buell 1 0:31 Tokyo , Japan
Loss 11–1–1 Joel Gerson 1 3:53 Tokyo , Japan

Question: What is the round number of the game between Rumina Sato and Michael Buell as an opponent?