[1] Mahitthi reached the semi-final at the 2006 IBSF World Amateur Championship in Amman, Jordan, where he was eliminated by Kurt Maflin 8–4.

He had a good run in the 2008 Bahrain Championship, winning 3 qualifying matches before being paired with veteran Steve Davis.

He narrowly lost 5–4 to Davis in the final qualifying round – which was perhaps unfortunate considering Davis was unlikely to play in the event due to a fixture clash, and he did withdraw a short time after.

In 2002 he qualified for the first round of the ranking LG Cup, but lost 1–5 in the first round proper to David Gray,[2] in one of the first televised matches to be refereed by Michaela Tabb.

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