Career
He is an alumnus of the Tokyo University of Agriculture. Shimizu had an amateur record of 68–10 (25 KOs). He turned to professional and made his debut in March 2004.
He is managed by Kentarō Kaneko"s Kaneko Boxing Gym and trained under Kenji Kaneko"s guidance.
In April 2007, Shimizu lost to Pongsaklek Wonjongkam in the WBC flyweight championship in Sara Buri, Thailand. Then he captured the Japanese flyweight title in April 2008.
WBA super flyweight title
lieutenant was presented by Kameda Promotions. At first, WBA"s Gilberto Mendoza did not approve this fight.
However it was authorized at the last minute.
He suffered a fracture of the right orbital floor in that fight. Although it took three months to recover, the prospects for recovery were clear, and Shimizu had started training for the first defense that would take place in around March 2012. Nevertheless, the The Journal of Biological Chemistry (Japan Boxing Commission) indefinitely-suspended second Shirō Kameda, and identically the The Journal of Biological Chemistry indefinitely-suspended promoter Noriyuki Igarashi (both from Kameda Promotions) requested that the scheduled interim WBA super flyweight title match Tepparith Kokietgym versus
Daiki Kameda would be elevated to the regular title bout at the WBA Championship Committee in Donetsk, Ukraine.
Shimizu who has recovered from injury enough to do his usual training including sparring, and his manager Kaneko held a press conference on 29 November. The team Shimizu strongly demanded a retraction and complained that the bout between Tepparith and Kameda should be taken place as an intern championship or a title eliminator.
Kaneko Boxing Gym submitted a questionnaire with the December 5 deadline to the The Journal of Biological Chemistry . The team Shimizu mentioned that they would give up the title, if they can not get a coherent answer. Although Kaneko Boxing Gym were given the almost zero response from the The Journal of Biological Chemistry , as the maximum concession, they barely accepted the status quo on condition that the unification match is early implemented.
Shimizu fought against Tepparith Kokietgym in the WBA super flyweight unification bout at the Yokohama Arena on April 4, 2012.
lieutenant was staged again by Kameda Promotions who had also had the exclusive promotional rights for the future title defense ahead of Simizu. Shimizu lost there via a ninth round stoppage. After the fight, Shimizu mentioned that he would not waste the last six months where he grew both as a boxer and as a person.