Petchbarngborn Kokietgym

On June 4, 2016, he competed with Paul Butler, a British boxer at Echo Arena Liverpool, Liverpool, Merseyside, England in eliminator fight for the winner to challenge WBO Super flyweight title with a Japanese holder, Naoya Inoue. But the fight was canceled, because Butler can't weight himself in 115 pounds, according to the rules.

He had many chances to travel abroad, but lose more than win. Wissanuchai also brought him under Kokiet "Sia Ko" Panichyarom of Kokiet Group. He became famous for wins over fellow Thai Wandee Singwancha, a former WBC Minimumweight world champion and won WBC Asia Super flyweight in 2011.

However, Karoon was also allowed to fight with Inoue on September 4 of the same year at Sky Arena, Zama, Japan by Chatchai Sasakul, a former WBC Flyweight champion as trainer. The result is that he is defeated TKO (referee stops contest) in the 10th round, because he was knocked down one time and not in the state to continue.

Karoon (nickname: Gap; แก๊ป) was born in Khwaeng Bang Bon (currently Bang Bon District), Bang Khun Thian District in Thonburi side, Bangkok. He started his career with Muay Thai since childhood. His father, Wissanuchai "Hua Taxi" Jarupianlerd, is the owner of Muay Thai gym and many Muay Thai fighters manager. His father believes that he wouldn't succeed in Muay Thai. So, let him change the professional boxing under Sor Thanapinyo Gym, and won Rajadamnern Stadium Light flyweight title in 2009.

Karoon Jarupianlerd (Thai: การุณ จารุเพียรเลิศ , born 15 August 1985), who boxes as Petchbarngborn Kokietgym or Petchbarngborn Sor Thanapinyo (เพชรบางบอน ก่อเกียรติยิม, เพชรบางบอน ส.ธนภิญโญ), was a Thai professional boxer in Super flyweight division.