Early promotional career

Petpanomrung made his Glory debut against Stanislav Reniţă at Glory 35: Nice on November 5, 2016.^[7] He won the fight by unanimous decision, with all five judges awarding him all three rounds of the bout.^[8]

Petpanomrung took part in the 2017 Glory Featherweight Contender Tournament, which was held at Glory 39: Brussels on March 25, 2017.^[9] In the semifinals, he won a unanimous decision against Aleksei Ulianov. Petpanomrung captured the tournament title with a split decision win over Serhiy Adamchuk.^[10]

Winning the Contender Tournament earned Petpanomrung a chance to fight for the vacant Glory Featherweight Championship against the #1 ranked contender Robin van Roosmalen at Glory 41: Holland on May 20, 2017.^[11] van Roosmalen won the fight majority decision to capture the title. Petpanomrung was deducted a point in the third round for excessive clinching.^[12]

After losing his next fight to Rambo PetchPTT at the Lumpini Stadium, Petpanomrung returned to Glory to fight Xie Lei at Glory 46: China on October 14, 2017.^[13] He won the fight by unanimous decision.^[14]

Petpanomrung faced Zakaria Zouggary at Glory 49: Rotterdam on December 9, 2017.^[15] He won the fight by a third-round head kick knockout. Petpanomrung was deducted a point in the third round for excessive clinching.^[16]

Petpanomrung faced Abdellah Ezbiri at Glory 53: Lille on May 12, 2018. He won the fight by a second-round head kick knockout.^[17] The knockout was later named the 2018 Glory "Knockout of the Year".^[18]

Glory Featherweight champion

Petpanomrung was expected to challenge the reigning Glory Featherweight champion Robin van Roosmalen at Glory 55: New York on July 20, 2018. Roosmalen withdrew from the bout with an injury on July 6. Petpanomrung was rescheduled to face Kevin VanNostrand for the interim featherweight championship instead.^[19] He won the fight by split decision.^[20] Petpanomrung signed a new multi-year deal with Glory on March 26, 2019.^[21]

Petpanomrung was booked to unify the Glory Featherweight Championship with the full champion Robin van Roosmalen at Glory 59: Amsterdam on September 29, 2018. The pair previously fought a year prior, at Glory 41: Holland, with van Roosmalen winning a majority decision in their first encounter.^[22] Petpanomrung won the fight by unanimous decision, with all five judges awarding him every round of the bout.^[23]

Petpanomrung made his first title defense against the former Glory featherweight champion Serhiy Adamchuk at Glory 63: Houston on February 2, 2019, in a rematch of their Glory 39 fight, which Petpanomrung won by split decision.^[24] He was more convincing in their second meeting, as he won the fight by unanimous decision, with all five judges scoring the bout 50–45 in his favor.^[25]

Petpanomrung was expected to face Sergey Kulyaba at All Star Fight on March 9, 2019.^[26] He later withdrew and was replaced by Fonluang Sitboonmee.^[27] Petpanomrung made his second title defense against Anvar Boynazarov at Glory 67: Orlando on July 5, 2019. He won the fight by another dominant unanimous decision.^[28]

Petpanomrung was expected to make his third title defense against Aleksei Ulianov at Glory 72: Chicago on November 23, 2019. Ulianov withdrew from the bout on June 24, due to visa issues, and was replaced with Kevin VanNostrand.^[29] The rematch between the two ended in a majority decision draw.^[30][31]

Petpanomrung made his fourth title defense against Serhiy Adamchuk at Glory 75: Utrecht on February 29, 2020, whom he had faced and beaten on two previous occasions.^[32][33] He won their trilogy bout by unanimous decision, with all five judges scoring the fight 49–45 for Petpanomrung.^[34]

Glory & RISE champion

Petpanomrung was expected to face the former RISE Lightweight champion Kento Haraguchi at RISE El Dorado 2021, on February 21, 2021.^[35] He was later removed from the event as a result of being unable to Japan due to safety protocols imposed to combat the COVID-19 pandemic.^[36] The fight was rescheduled for RISE World Series 2021 Osaka 2 on November 14, 2021. He won the fight by unanimous decision, with two judges awarding Petpanomrung a 30-28 scorecard, while the third judge scoring the fight 30–29 in his favor. Petpanomrung was shown a yellow card in the second round for excessive clinching.^[37]

Petpanomrung faced Kento Haraguchi for the inaugural RISE World Super Lightweight Championship at RISE World Series Osaka 2022 on August 21, 2022.^[38] The fight was ruled a split decision draw after the first five rounds, with one judge scoring the bout 50–49 for Haraguchi, the second scoring it 49–48 for Petpanomrung and the third judge scoring it as an even 49–49 draw. Petpanomrung was awarded the unanimous decision, after an extra sixth round was contested.^[39]

Petpanomrung was booked to make his return to Glory to defend the Glory Featherweight Championship against the #5 ranked featherweight contender Abraham Vidales at Glory: Collision 4 on October 8, 2022.^[40] He retained the title by unanimous decision, with all but one judge awarding him all five rounds of the bout.^[41]

Petpanomrung faced the RISE Super Lightweight champion Kosei Yamada in a non-title bout at RISE World Series / Shootboxing-Kings on December 25, 2022.^[42] He won the fight by unanimous decision, with two scorecards of 30-29 and one scorecard of 30–28.^[43]

Petpanomrung moved up to lightweight to challenge the Glory Lightweight titleholder Tyjani Beztati at Glory 84 on March 11, 2023.^[44] He lost the fight by a fourth-round knockout.^[45]

Petpanomrung made his sixth Glory Featherweight Championship defense against the #4 ranked Glory featherweight contender Ahmad Chikh Mousa at Glory 86 on May 27, 2023.^[46] He retained the title by unanimous decision.^[47]

Petpanomrung made his seventh title defense against promotional newcomer David Mejia at Glory 89 on October 7, 2023.^[48] He retained the title by split decision.^[49]

Petpanomrung made his first RISE Super Lightweight World title defense against RISE WORLD SERIES 2023 Final Round on December 16, 2023.^[50] He lost the fight by unanimous decision to Chadd Collins.^[51]