[10] Poomjaeng beat Michael Leslie 10–4, Liu Chuang 10–9, Anthony Hamilton 10–4 and Jamie Cope 10–3 to qualify for the World Championship for the first time.

[11] He faced sixth seed Stephen Maguire in the first round and produced a huge shock with the world number 70 Poomjaeng winning 10–9, with a composed 63 break in the final frame.

The crowd warmed to Poomjaeng as he walked to the wrong table at the start of play and animatedly expressed his emotions throughout the match, including applauding his own safety shot.

[12][13] He played Michael White in the second round and lost the fourth frame without a ball having been potted due to missing the reds three times.

[16] In his opening match of the season, Poomjaeng defeated Darren Cook 5–1 to qualify for the 2013 Wuxi Classic in China where he beat Dominic Dale 5–1 in the first round, before losing by a reverse of this scoreline to John Higgins.

[21] Poomjaeng saw off Zhang Anda and Craig Steadman to stand one match away from playing in the World Championship for the second year in a row, but from 4–2 ahead he lost eight of the last nine frames against 1997 champion Ken Doherty to miss out.

[23] At the Paul Hunter Classic, Poomjaeng won three matches and then defeated Neil Robertson 4–2 to reach the quarter-finals where he lost 4–2 to Rod Lawler.

[27] Poomjaeng took it on the final black and then whitewashed Jack Lisowski 5–0 to play in the last 16 of a ranking event for the only time this season, where he lost 5–1 against Gary Wilson.

He defeated Chris Melling 6–4 and Ryan Day 6–2 at the UK Championship and recovered from 5–0 down against Mark Joyce to win 6–5 and reach the fourth round.

[29] A pair of 4–1 victories over Craig Steadman and Robert Milkins saw Poomjaeng reach the third round of the Welsh Open, where he was beaten 4–3 by Yu Delu.