In September 2011 he played in his first Japan Golf Tour event, the 2011 Asia-Pacific Panasonic Open, where he made the cut and finished tied for 65th.

[2] Janewattananond achieved his first career win on the Asian Tour in February 2017 at the Bashundhara Bangladesh Open.

This win brought him into the world top 100 and secured him a place in the 2019 Open Championship.

[4] In November 2022, Janewattananond won the International Series Morocco on the Asian Tour.

CUT = missed the half-way cut "T" indicates a tie for a place NT = No tournament due to COVID-19 pandemic 1Cancelled due to COVID-19 pandemic NT = No tournament "T" = Tied Professional