He has represented Singapore along with Paul Lim (no relation) in four 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.