According to Muaymag.com, Saenchai Sor Kingstar (arguably the pound or pound best Muay Thai fighter in the world) is looking to quit fighting soon...at least at home.
He has expressed interest in picking up fights here and there overseas and, more interestingly, play some football (soccer) with the Muangthong Nongchok team in Bangkok
Details here: http://muaymag.com/saenchai-may-quit-muaythai-this-year-due-to-trouble-finding-opponents.html
To be quite honest, unless he starts giving up ridiculous amounts of weight, I think Saenchai will probably walk through most of his overseas opponents until he really starts getting too "over the hill" for fighting.
If you have never heard of Saenchai, go look him up! I posted a video or two of him on the blog too