Exactly five years ago, Hamasaki's home country of Japan was hit with an earthquake and then a tsunami. More than 18,500 people either died or went missing.
Hamasaki wanted to honor those victims on the anniversary of the date.
"My fight was canceled and a lot people passed away," Hamasaki said through a translator. "I had a special feeling going into this fight."
It came through in the cage.
Hamasaki successfully defended her Invicta FC atomweight title against Amber Brown, via armbar submission at 2:52 of the third round in the main event of Invicta FC 16 at the Tropicana Las Vegas.