He first came into prominence in 1986, when he won the BDO World Youth Masters, defeating Rowan Barry of Australia in the final.

He Runner-Up the number 4 seed of 1987 BDO World Youth Championship defeating champion 1986 Mark Day and losing to Rowan Barry of Australia.

He has represented Singapore along with Paul Lim (no relation) in eight PDC World Cup of Darts tournaments, with their biggest success being in the 2017 tournament when they defeated the top seeds Scotland (consisting of Gary Anderson and Peter Wright), then knocked out the Spanish pairing of Cristo Reyes and Antonio Alcinas, before losing the quarter-final to Belgium, although Harith defeated Ronny Huybrechts in his singles match, before he and Paul lost to Kim and Ronny in the doubles.

He will play along with his friend (Paul Lim) in the upcoming PDC World Cup of Darts representing Singapore.

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