On March 25, 2011, Phetmorakot defeated Wanchai Sor Kittisak to win the Lumpinee Stadium Mini Flyweight (105 lbs) title. On April 9, 2013, he defeated Thong Puideenaidee at Lumpinee Stadium to win the Thailand (PAT) Super Bantamweight (122 lbs) title. On December 3, 2013, Phetmorakot won his second Lumpinee title by defeating Auisiewpor Sujibamikiew to capture the vacant Lumpinee Stadium Super Featherweight (130 lbs) title. On February 28, 2014, he defeated Kwankhaw Mor Ratanabandit to retain the Lumpinee Stadium Super Featherweight title. He successfully defended his Lumpinee Stadium title a third time by defeating
Genji Umeno via unanimous decision in
Japan on April 19, 2015. On October 9, 2014, he defeated the legendary
Saenchai PKSaenchaimuaythaigym by decision after five rounds of battle at
Rajadamnern Stadium. On December 8, 2015, Phetmorakot defeated
Petchboonchu FA Group at Lumpinee Stadium to win the Thailand (PAT) Super Lightweight (140 lbs) title, marking his second Thai national Muay Thai title victory. On December 25, 2015, Phetmorakot defeated future
Glory Featherweight Champion Petpanomrung Kiatmuu9 to win the Toyota Vigo Marathon 62 kg Tournament. On July 29, 2016, Phetmorakot later entered the one-night Toyota Hilux Revo Superchamp Tournament that took place in
Tokyo,
Japan. In the Quarter Finals, he defeated Masashi Hirano by second-round TKO due to a cut. He then defeated
Chamuaktong Fightermuaythai in Semi Finals by decision. In the Tournament Final, he defeated Silarit Chor Sampeenong by second-round KO to win the Toyota Hilux Revo Superchamp 63.5 kg Tournament. On October 28, 2016, Phetmorakot defeated
Azize Hlali by second-round KO at
YOKKAO 21 in
Hong Kong. On April 28, 2018, Phetmorakot defeated Mohamed Souanane by TKO at Phoenix Fighting Championship 7 in
Phuket to win the Phoenix Fight Championship 149 lb title. On October 4, 2019 at the Hilux Revo Muay Thai Marathon in
Chiang Rai, Phetmorakot defeated Ali Ebrahimi by second-round KO to win the
WBC Muaythai Diamond Middleweight Championship. As a result, he became the fourth fighter to win a WBC Diamond Championship belt.
ONE Championship On June 23, 2018, Phetmorakot Petchyindee Academy made his
ONE Championship debut at
ONE Championship: Pinnacle of Power, where he defeated Fabrice Fairtex Delannon by TKO in the second round. Next, on October 6, 2018, he faced
Alaverdi Ramazanov at
ONE Championship: Kingdom of Heroes, where he lost by unanimous decision. He would bounce back on December 7, 2018, at
ONE Championship: Destiny of Champions, where he defeated
Liam Harrison by second-round knockout. On March 8, 2019, he defeated Kenta Yamada by unanimous decision at
ONE Championship: Reign of Valor.
ONE Kickboxing Featherweight World Grand Prix Phetmorakot was later selected as a competitor in the ONE Super Series Kickboxing Featherweight World Grand Prix, which included other fighters like
Yodsanklai Fairtex and
Giorgio Petrosyan. His opponent in the Quarter-Finals was Giorgio Petrosyan. On May 17, 2019, Phetmorakot faced Giorgio Petrosyan in the Kickboxing Featherweight World Grand Prix Quarter-Finals at
ONE Championship: Enter the Dragon, where he won a closely contested split decision. However, the result of the fight was overturned to a no-contest when reviews showed that Phetmorakot had used illegal clinching throughout the fight. A rematch was scheduled for July 12, 2019 at
ONE Championship: Masters of Destiny, where Phetmorakot lost by unanimous decision and was eliminated from the Kickboxing Featherweight World Grand Prix.
Post-Grand Prix On November 22, 2019, Phetmorakot defeated Charlie Peters by second-round KO at
ONE Championship: Edge Of Greatness.
ONE Featherweight Muay Thai World Champion Phetmorakot is scheduled to face Jamal Yusupov for the inaugural
ONE Featherweight Muay Thai World Championship at
ONE Championship: Warrior's Code on February 7, 2020. However, Yusupov was later forced to withdraw from the match and Phetmorakot will now face fellow Thai fighter
Detrit Sathian Muay Thai for the ONE Featherweight Muay Thai Title. Detrit was later pulled from the bout and was replaced by
Pongsiri P.K.Saenchaimuaythaigym, who took the fight on just two days' notice. Phetmorakot would defeat Pongsiri by unanimous decision to become the first ONE Featherweight Muay Thai World Champion. Phetmorakot made a defense of the ONE Featherweight Muay Thai World Championship for the first time against Muay Thai legend
Yodsanklai Fairtex at
ONE Championship: No Surrender on July 31, 2020. He successfully retained the title with a split decision victory over Yodsanklai. Phetmorakot was scheduled to make his second defense of the ONE Featherweight Muay Thai World Championship against Magnus Andersson at
ONE Championship: A New Breed 3 on September 18, 2020. Phetmorakot won the fight via third-round knockout. Phetmorakot was scheduled to make his third title defense against Jamal Yusupov at
ONE: Full Circle on February 25, 2022. The bout was later cancelled, and Phetmorakot was re-booked to face
Jimmy Vienot at
ONE 157 on May 20, 2022. Petchmorakot won the fight by split decision. Phetmorakot made his fourth ONE Featherweight Muay Thai title defense against
Tawanchai P.K. Saenchaimuaythaigym at
ONE 161 on September 29, 2022. He lost the fight and title by unanimous decision.
Post-ONE Championship Due to a disagreement between his gym,
Petchyindee Academy, and
ONE Championship, all Petchyindee fighters were released from the promotion at the request of the gym. After Post-ONE FC Petchmorokat went 5-1 in Rajadamnern World Series, fought Kaito twice in Shootboxing winning the first and losing the rematch for the world title. Petchmorokat fought twice in K-1 Rules against Han Feilong and Masoud Minaei losing both by decision. Petchmorokat won the Rajadamnern Stadium Middleweight (160 lbs) title against Joe Ryan and defended it against Josh Hill, Nayanesh Ayman, Kongjak Por.Paoin. ==Titles and accomplishments==