| Shwe Sai | |
| Other Names: | ရွှေဆိုင်း |
| Nationality: |  Burmese |
| Birth Place: | Karen State, Myanmar |
| Weight: | 80kg |
| Stance: | orthodox |
| Children: | Sai Maung Maung (son)[1] |
Shwe Sai (Burmese: ရွှေဆိုင်း), is a retired Burmese Lethwei fighter and former Openweight Lethwei World Champion.[2]
Shwe Sai is born in the Karen state and has a son named Sai Maung Maung, who also competes in Lethwei and who is signed to the World Lethwei Championship.
On 10 and 11 July 2004, Shwe Sai and teammates Aye Bo Sein, Naing Wan Lay and Win Tun competed in a Lethwei tournament at Thuwunna National Indoor Stadium in Yangon, Myanmar.[3] The Burmese fighters were matched against four Japanese fighters: Tamura, Yoshitaro Niimi, Takaharu Yamamoto and Seiji Wakasugi.[4] [5]
During his reign, Shwe Sai faced Zaw Win Tun, 1996 Golden Belt Champion, with Shwe Sai having the upper hand having won one fight while the other was a draw.[6] On 2 August 2019, Shwe Sai's son Sai Maung Maung, was supposed to continue the rivalry and face the son of his past rival Saw Win Tun at WLC 9: King of Nine Limbs, but the fight was cancelled due to medical reason.
In 2006, Shwe Sai was stripped of the Openweight Lethwei World title due to inability to defend the title. Former Openweight champion Shwe War Tun was selected to faced number one contender Lone Chaw. Both men fought for the now vacant title to crown a new champion and Lone Chaw was victorious becoming the new Openweight Champion.[7] On 4 May, 2009, as reposted by MMA Mania, Shwe Sai and Lone Chaw eventually faced each other in Yangon. Shwe Sai knocked down Lone Chaw in a spectacular manner.[8]
|- style="background:#c5d2ea;"| 2019-11-25 || Draw || align="left" | Saw Nga Man || Myanmar vs. Thailand Challenge Fights, Myaing Gyi Ngu || Hpa-an, Myanmar || Draw || 2 || 3:00|- style="background:#c5d2ea;"| 2011 || Draw || align="left" | Phoe Kay || Challenge Fight [9] || Myanmar || Draw || 5 || 3:00|- style="background:#c5d2ea;"| 2010-01-10 || Draw || align="left" | Yan Gyi Aung || Win Sein Taw Ya 2010 [10] || Mudon Township, Myanmar || Draw || 5 || 3:00|- style="background:#c5d2ea;"| 2009-04-05 || Draw || align="left" | Lone Chaw || Dagon Shwe Aung Lan Final || Yangon, Myanmar || Draw || 5 || 0:18 |- style="background:#fbb;"| 2009-02-28 || Loss || align="left" | Yan Gyi Aung || Dagon Shwe Aung Lan Semi-final || Yangon, Myanmar || Decision || 5 |||- style="background:#c5d2ea;"| 2008-04-27 || Draw || align="left" | Yan Gyi Aung || Challenge Fights, Aung San National Indoor Stadium || Yangon, Myanmar || Draw || 5 || 3:00|-! style=background:white colspan=9 ||- style="background:#c5d2ea;"| 2005-10-16 || Draw || align="left" | Lone Chaw || 2nd City F.M Aung Lan Tournament, M.C.C. || Yangon, Myanmar || Draw || 5 || 3:00|- style="background:#c5d2ea;"| 2004-07-11 || Draw || align="left" |
Yoshitaro Niimi || Myanmar vs. Japan Challenge Fights || Yangon, Myanmar || Draw || 5 || 3:00|- style="background:#cfc;"| 2004-06-13 || Win ||align=left| Wan Chai || Challenge Fights, Thuwunna Gymnasium || Yangon, Myanmar || TKO || 3 || 2:52|- style="background:#cfc;"| 2004 || Win ||align=left| Shan Lay Thway || Challenge Fight 2004 || Yangon, Myanmar || KO || |||-! style=background:white colspan=9 ||- style="background:#c5d2ea;"| 1999-08-01 || Draw || align="left" | Ali || Ba Htoo football field || Mandalay, Myanmar || Draw || 5 || 3:00|-! style=background:white colspan=9 | |-| colspan=9 | Legend: