"I have never played him (Donovan) in a stepladder match and did not know what to expect," said the 16-year-old, who was introduced to the sport by his father nine years ago.
"I did not expect to win but I just felt really fired up and it helped me achieve what I did.
"I was carrying a shoulder injury in the tournament last year and only managed to win a silver through the team event.
"It feels good to be able to play my best and win it this time.
"It is my dream to represent the country one day and I hope to continue playing well and hopefully earn a call-up to the national team in the near future.
"I know it is not easy but I will do all I can to achieve it."
The girls' Under-18 title went to Penang's Anis Shazlin Zulkhisham after she beat Putrajaya's Nur Dayana Zuhdi 452 (255,197)-385 (174,211).
Siti Nur Zulaika Ismail, who lost to Nur Dayana 212-179, finished third.
The boys' Under-15 gold went to Tun Ameerul Luqman Al-Hakim Tun Hasnul Azam of Selangor who beat Negri Sembilan's Muhd Al Qayyum Syafiq Noor Akmal 371 (173, 198)-322 (163, 159) in the decider.
Muhd Azri Azni (Johor), who lost to Mohd Al Qayyum 182-142, took the bronze.
Sarawak's Gillian Lim emerged victorious in the girls' Under-15 after beating Selangor's Nur Syazwani Sahar 470 (233, 237)-431 (200, 231) in the final.
Siti Nur Aisyah Satar, who lost to Gilian 214-157, finished third. By Fadhli Ishak
*Sumber Dari New Straits Times