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At the 2010 BWF World Junior Championships, Guadalajara, he won a bronze medal in the men's doubles category. He won gold in the men's doubles in 2012 in Chiba Prefecture. He won bronze in the 2012 Asian Junior Championships in men's doubles.

In 2013, Ng participated in the 2013 BWF World Championships in Guangzhou, China, was the runner-up at the Vietnam International Challenge in men's singles, and competed in the 2013 East Asian Games in Tianjin for Hong Kong, winning a silver medal in the men's team and bronze in the men's doubles.

In 2014, Ng won the China International Challenge, Osaka International Challenge and Irish Open. He was the runner-up at the Canadian Grand Prix and the Swiss International tournaments.

In 2015, Ng won the men's singles title at the Austrian Open. He later won his first Grand Prix title at the Bitburger Open. He also came second at the Canadian Grand Prix and reached the semifinals at the Hong Kong Super Series, having beaten top 10 players like Lin Dan and Chou Tien Chen before losing to the legendary Lee Chong Wei.

In 2016, Ng made history by becoming the first home player to win the men's singles title at the Hong Kong Open, beating India's Sameer Verma in the final. He also competed at the 2016 Summer Olympics.

After a damp 2022, Ng found his form in 2023 by reaching the final of the Thailand Masters and winning the German Open. At the 2023 Badminton Asia Championships, he defeated the defending champion Lee Zii Jia in straight games in the first round, which was his second consecutive victory over the former All England champion.