Saensak Muangsurin

Saensak Muangsurin
Saensak in 1976
BornBoonsong Mansri
August 13, 1950
Tambon Ban Sadiang, Mueang Phetchabun, Phetchabun, Thailand
DiedApril 16, 2009 (aged 58)
Rajvithi Hospital, Bangkok, Thailand
Native nameบุญส่ง มั่นศรี
NicknameWorld Collapsing Southpaw (ซ้ายทลายโลก)
Pink Southpaw (ซ้ายสีชมพู)
Height170 cm (5 ft 7 in)
WeightSuper lightweight
Welterweight
StyleMuay Thai
(Muay Mat)
StanceSouthpaw
Professional boxing record
Total20
Wins14
By knockout11
Losses6
Medal record
Representing  Thailand
Men's amateur boxing
Southeast Asian Peninsular Games
1973 Singapore Super lightweight

Boonsong Mansri (Thai: บุญส่ง มั่นศรี; 13 August 1950 – 16 April 2009), known professionally as Saensak Muangsurin (Thai: แสนศักดิ์ เมืองสุรินทร์), was a Thai professional Muay Thai fighter and boxer. He was a Lumpinee Stadium super-lightweight champion in Muay Thai, as well as a WBC super-lightweight world champion in boxing. In 1975, he won a major world boxing title in his third professional fight, 241 days after his debut, which is still the record over 50 years later (later matched by Vasiliy Lomachenko in 2014 in terms of number of bouts). He is also Thailand's heaviest world boxing champion to date. Nicknamed the "World Collapsing Southpaw," he is often regarded as one of the most fearsome punchers in Muay Thai history.