In his homeland, Saengkham beat the likes of reigning world champion Stuart Bingham and ranking event winners Michael White and Joe Perry to play in the semi-finals of the 2015 Six-red World Championship, where he lost 73 to compatriot Thepchaiya Un-Nooh. A 62 win over Stephen Maguire saw him qualify for the International Championship for the second year in a row, but he was knocked out 64 by Oliver Lines in the opening round. He lost 65 and 43 in the first rounds of both the UK Championship and Welsh Open to Xiao Guodong and Fergal O'Brien respectively. Saengkham won a deciding frame against Lines to qualify for the China Open. He shocked Neil Robertson 53 in the first round and then beat Ben Woollaston 54 and Graeme Dott 51 to make the quarter-finals of a ranking event for the first time. A bad start from Saengkham saw him lose the opening four frames to John Higgins, but he then pulled it back to 43.
Saengkham defeated Alfie Burden 64 to qualify for the International Championship and beat Stephen Maguire 65, before losing in another deciding frame in the second round to Xiao Guodong.
A 60 thrashing of Ken Doherty saw him reach the second round of the UK Championship, where he made a 131 break to lead John Higgins 32, before going on to be defeated 64. He reached the last 32 of the Scottish Open by beating Craig Steadman and Aditya Mehta, but he was whitewashed 40 by Judd Trump. Saengkham had to wait until October to win his first match of the season in the main draw of a ranking event when he beat Michael Georgiou 41 at the English Open. A 53 victory against Robert Milkins followed and he then lost 52 to Stuart Bingham. After Saengkham overcame Jak Jones 105 and Anthony Hamilton 109 he was one win away from qualifying for the World Championship. He lost 40 to Xiao Guodong in the second round. Saengkham defeated Tom Ford 53 to qualify for the China Open.
In qualifying for the 2013 Australian Goldfields Open, Saengkham beat Andrew Pagett 53 and Thanawat Thirapongpaiboon, Anthony McGill and Jamie Jones all by 51 scorelines to reach the main draw of a ranking event for the first time in his career.
Saengkham did not play a match in a professional snooker event during the 2011/2012 season. In the 2012/2013 season he came through Group G of the 2012 Six-red World Championship, but then lost 56 to Graeme Dott in the last 32. He was awarded a wildcard for the 2013 World Open and lost 45 to Mark Joyce. In April he won the ACBS Asian Under-21 Snooker Championship by defeating Pakistan's Mohammad Majid Ali 65 on the final pink.
The defending champion was Ronnie O'Sullivan, who defeated Kyren Wilson in the 2017 event. However, O'Sullivan would lose to Mark Davis 16 in the semi-final. O'Sullivan was highly critical of the venue stating "The worst part was not the smell of urine..."This is about as bad as I've ever seen.
Thepchaiya Un-Nooh made the second maximum break of his career with a 147 in the opening frame of his 41 first round win against Soheil Vahedi. On the following day Ronnie O'Sullivan made the 15th maximum break of his career with a 147 in the final frame of a second round whitewash of Allan Taylor. This was the fourth time that two maximums were made at the main stage of a ranking tournament, and the third time in just over half a year.