Nonthasit Phetnamthong (; born 16 October 1994), known professionally as Prajanchai P.K.Saenchai Muaythaigym () is a Thai professional Muay Thai fighter, kickboxer, and former boxer currently signed to ONE Championship. He is both the reigning ONE Strawweight Muay Thai World Champion and ONE Strawweight Kickboxing World Champion as well as a two-time Lumpinee Stadium champion and three-time Rajadamnern Stadium champion across four divisions.
Prajanchai also won a WBA Asia South Featherweight title. As of August 2024, he is the #8 ranked Bantamweight kickboxer by Beyond Kickboxing, the #7 ranked Flyweight kickboxer by Combat Press, and the #9 ranked P4P and #2 ranked Super Featherweight Muay Thai fighter by Combat Press.
Boxing career Prajanchai made his boxing debut on 29 August 2020, when he was scheduled to challenge the reigning WBA Asia South featherweight champion Arnon Yupang. Prajanchai won the fight by split decision, with scores of 96–94, 97–93 and 94–96.
In his second professional boxing bout, held on 31 October 2020, Prajanchai faced the former WBC Light Flyweight champion Kompayak Porpramook. He won the fight by unanimous decision, with all three judges awarding him all ten rounds of the bout.
Prajanchai was scheduled to face Suradech Ruhasiri on 24 April 2021. He won the fight by unanimous decision, once again taking all ten rounds on all the judges' scorecards.
Titles and accomplishments
Muay Thai
OneSongchai 2012 S-1 Flyweight (112 lbs) Champion Rajadamnern Stadium 2010 Rajadamnern Stadium Minimumweight (105 lbs) Champion 2011 Rajadamnern Stadium Minimumweight (105 lbs) Champion 2012 Rajadamnern Stadium Flyweight (112 lbs) Champion Lumpinee Stadium 2014 Lumpinee Stadium Bantamweight (118 lbs) Champion 2020 Lumpinee Stadium Super Bantamweight (122 lbs) Champion ONE Championship ONE Strawweight Muay Thai World Champion (current) One successful title defense (second reign) 2023 interim ONE Strawweight Muay Thai World Champion Performance of the Night (One-time) ONE Strawweight Kickboxing World Champion (One time) Boxing World Boxing Association 2020 WBA Asia South Featherweight (126 lbs) Champion
Professional boxing record
{|class="wikitable" style="text-align:center; font-size:95%" |- ! !Result !Record !Opponent !Method !Round, time !Date !Location !Notes
|3 |Win |3–0 |align=left| Suradech Ruhasiri | |10 |24 April 2021 |align=left| Suanlum Night Bazaar, Ratchadaphisek, Bangkok
|2 |Win |2–0 |align=left| Kompayak Porpramook | |10 |31 October 2020 |align=left| Suanlum Night Bazaar, Ratchadaphisek, Bangkok
|1 |Win |1–0 |align=left| Arnon Yupang | |10 |29 August 2020 |align=left| Suanlum Night Bazaar, Ratchadaphisek, Bangkok |
Muay Thai and Kickboxing record
|- style="background:#;" | 2026-10-16 || ||align=left| Wang Junguang || ONE The Inner Circle 35, Lumpinee Stadium || Bangkok, Thailand || || ||
|- style="background:#fbb;" | 2025-10-03 || Loss||align=left| Jonathan Di Bella || ONE Fight Night 36 || Bangkok, Thailand || Decision (Unanimous)|| 5||3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2025-02-08 ||Win||align=left| Ellis Barboza || ONE Fight Night 28 || Bangkok, Thailand || TKO (doctor stoppage)|| 4||1:55 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2024-06-28 ||Win ||align=left| Jonathan Di Bella || ONE Friday Fights 68 || Bangkok, Thailand || Decision (Unanimous) || 5||3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2023-12-22 || Win ||align=left| Joseph Lasiri || ONE Friday Fights 46 || Bangkok, Thailand || |KO (elbow) |1 |1:28 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2023-09-22 || Win ||align=left| Akram Hamidi || ONE Friday Fights 34, Lumpinee Stadium || Bangkok, Thailand || Decision (Unanimous) || 3 || 3:00
|- style="background:#cfc" | 2023-06-23|| Win ||align=left| Sam-A Gaiyanghadao || ONE Friday Fights 22, Lumpinee Stadium || Bangkok, Thailand || KO (Right elbow) || 2||2:10 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2023-01-20|| Win ||align=left| Kompetch Sitsarawatsuer || ONE Friday Fights 1, Lumpinee Stadium || Bangkok, Thailand || Decision (Unanimous) || 3 || 5:00
|- style="background:#fbb;" | 2022-05-20|| Loss ||align=left| Joseph Lasiri || ONE 157 || Kallang, Singapore || TKO (Retirement) || 3 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2021-07-30|| Win ||align=left| Sam-A Gaiyanghadao || ONE Championship: Battleground || Kallang, Singapore || Decision (Majority) || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2021-03-28|| Win ||align=left| Ronachai Tor.Ramintra || Channel 7 Stadium || Bangkok, Thailand || Decision (Unanimous) || 5 || 3:00
|- style="background:#cfc;" | 2020-12-08|| Win ||align=left| Kompetch Sitsarawatsuer || Lumpinee Birthday Show, Lumpinee Stadium || Bangkok, Thailand || Decision || 5|| 3:00
|- style="background:#fbb;" | 2020-10-05||Loss ||align=left| Kompetch Sitsarawatsuer || R1 UFA, World Siam Stadium || Bangkok, Thailand || Decision||5 ||3:00
|- style="background:#cfc;" | 2020-02-11|| Win ||align=left| Petchsamarn Sor.Samarngarment || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2019-12-06|| Win||align=left| Petchsamarn Sor.Samarngarment || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#c5d2ea;" | 2019-11-02|| Draw|| align="left" | Sprinter Pangkongprab || Maximum Muay Thai Fight || Brazil, São Paulo || Decision || 5 || 3:00
|- style="background:#cfc;" | 2018-05-15|| Win||align=left| Worawute Baovigym || Lumpinee Stadium || Bangkok, Thailand || KO (Elbow) || 3 ||
|- style="background:#fbb;" | 2018-03-28|| Loss||align=left| Chalam Parunchai || WanParunchai + Poonseua Sanjorn || Nakhon Si Thammarat, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2018-01-24|| Win||align=left| Morakot Phetsimuen || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-12-15|| Win||align=left| Morakot Phetsimuen || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-11-14|| Win ||align=left| Sprinter Pangkongprab|| Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-09-05|| Win ||align=left| Ronachai Tor.Ramintra || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-08-03|| Win ||align=left| Kiewpayak Jitmuangnon || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2017-06-07|| Loss ||align=left| Morakot Phetsimuen || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-03-30|| Win ||align=left| Puenkon Tor.Surat || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2017-02-08|| Loss ||align=left| Puenkon Tor.Surat || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2017-01-12|| Win ||align=left| Yodmungkol Muangsima || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-09-30|| Loss ||align=left| Sing Parunchai || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2016-07-21|| Win ||align=left| Sing Parunchai || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-05-22|| Loss ||align=left| Luknimit Singklongsi|| Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-04-29|| Loss ||align=left| Chalam Parunchai || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-03-31|| Loss ||align=left| Luknimit Singklongsi|| Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2016-03-04|| Loss ||align=left| Chalam Parunchai || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-12-23|| Win ||align=left| Phetnamngam Aor.Kwanmuang || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-12-06|| Win ||align=left| Toma || The Battle of Muaythai 10～ The 10th anniversary || Yokohama, Japan || Decision (Unanimous) || 5 || 3:00
|- style="background:#cfc;" | 2015-10-14|| Win ||align=left| Yodmongkol Tor.Laksong || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-09-05|| Win ||align=left| Yardfar R-Airline || Montri Studio || Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-08-07|| Win ||align=left| Phet Sawansangmanja || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-07-02|| Win ||align=left| Kengkla Por.Pekko || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-05-28|| Win ||align=left| Chorfah Tor.Sangtiennoi || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2015-05-07|| Loss ||align=left| Yodmungkol Muangsima || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#c5d2ea;" | 2015-03-30|| Draw||align=left| Chorfah Tor.Sangtiennoi || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-02-12|| Win||align=left| Luknimit Singklongsi|| Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2015-01-08|| Win||align=left| Lamnapong Yuthachonburi || Rajadamnern Stadium || Bangkok, Thailand || KO || 4 ||
|- style="background:#fbb;" | 2014-12-09|| Loss||align=left| Panpayak Jitmuangnon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#fbb;" | 2014-10-08|| Loss||align=left| Luknimit Singklongsi|| Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2014-09-05|| Win ||align=left| Panpayak Jitmuangnon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 |
|- style="background:#cfc;" | 2014-08-14|| Win ||align=left| Chorfah Tor.Sangtiennoi || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2014-07-16|| Win ||align=left| Maethee Sorjortoipadriw || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2014-05-07|| Win ||align=left| Pichitchai P.K.Saenchaimuaythaigym || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2014-02-28|| Loss||align=left| Mondam Sor.Weerapon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2014-01-07|| Win ||align=left| Mondam Sor.Weerapon || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2013-12-03|| Win ||align=left| Eakmongkol Kaiyanghadaogym || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2013-11-06|| Win ||align=left| Yodmongkon Muangseema || Rajadamnern Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;" | 2013-07-09|| Win||align=left| Wanchalong PK.Saenchai || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2013-06-03|| Loss||align=left| Yokpet Sompongmataput || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#fbb;" | 2013-04-05|| Loss ||align=left| Sangmanee Sor Tienpo || Lumpinee Stadium || Bangkok, Thailand || Decision || 5 || 3:00
|- style="background:#cfc;"