In March 2006, Sithchatchawal took part in what later won Ring Magazine fight of the year when he challenged WBA Super Bantamweight champion Mahyar Monshipour.
Caballero won by TKO by knocking Sithchatchawal down three times in the third round—causing the referee to cease the bout.
The September 15, 2008, split decision 8th round win of Filipino Joel De La Cruz over Somsak Sithchatchawal, at the Cebu Coliseum, was officially amended to a draw due to apparent error in scorecards tally.
Cebu Games and Amusements Board explained that "there was no problem on the scorecards of 3 judges -- Edward Ligas and Salven Lagumbay of the Philippines and Saween Taweekon of Thailand -- after 7 rounds.
But, at the end of round 8, Mendoza admitted he thought the 10-9 score in favor of de La Cruz was by Lagumbay and not from the Thai judge.