On Friday, the second day of the 78th edition, that monkey was finally off his back as he kept his calm on the stretch back to make the cut as he added a 74 to his first 73 and at three-over 147 he was tied 37th.
It also enabled Thongchai to complete his 'career grand slam' of made cuts in all the Major championships.
KJ Choi (70-75), who has three top-10 finishes at Masters in the past, went up to second with a birdie-birdie start, before falling down to tied 21st by the end of the day.
Veteran Fred Couples, who won the 1992 Masters continued his love affair with the Masters with round of 71-71 as he tied for seventh with young hot-shot and winner of three PGA Tour titles this season, Jimmy Walker (70-72) and the 2003 US Open winner, Jim Furyk (74-68).
Thongchai, who recently captained Team Asia to a tie with Europe in Malaysia last month, while taking on a star-studded Team Europe, also becomes the first Thai to make the cut. Three other Thais Sukree Onsham, Thaworn Wiratchant and Prayad Marksaeng, have failed in the past.