Unseeded Italian Samuele Ramazzotti knocked out boys' singles top seed Nawakarn Khunjan of Thailand 6-7, 6-4, 6-1 to move into the semi-finals of the 49th International Tennis Federation (ITF) Junior Circuit yesterday.
The win pits him against 11th seed Katsuya Ikezoi from Japan in today's second game on center court.
Second seed Shohei Chikami and 13th seed Yousuke Watanuki, both from Japan, will start the day's action at the National Tennis Centre of the Hassanal Bolkiah National Sports Complex in Berakas at 9am.
Girls' singles top seed Kwan Yau Ng from Hong Kong was dumped out of the competition on Thursday after suffering a 6-3, 6-0 loss to 15th seed Qi-Li Ma from China.
Eleventh seed Mihika Yadav from India will play 12th seed Yang Lee from Chinese Taipei on court one, while sixth seed Khim Iglupas from the Philippines takes on Qi-Li Ma on court two at 9am.
The girls' doubles top seeds, Miyo Kobayashi from Japan and Yi-Chi Ma from Chinese Taipei secured their spot in the final after handing a 6-3, 6-1 beating to sixth seeds from Chinese Taipei, Tzu-Hui Chen and Pei Ju Hsieh.
They will be facing fifth seeds Yang Lee and Qi-Li Ma in the third game on centre court.
Kobayashi who partnered Singapore's Rheeya Doshi to lift the girls' doubles title of the 48th edition is hoping for a repeat of the results.
"So far the tournament has been alright, I cramped up in the singles so now I will try to be champions in the doubles," said Kobayashi.
"Lee and Ma are actually my friends and... if we play well we could beat them but it will be a tough match if we don't," she said.
Boys' doubles top seeds Anthony Susanto and Tio Juliandi Hutauruk moved into the final after recording a 6-4, 3-6, 10-3 win over fourth seeds Nawakarn and Vorachon Rakpuangchon of Thailand.
They will be taking on eighth seeds Tin Chen and Chung Han Tsai from Chinese Taipei in the fourth and final match of the day.
Anthony Susanto is expecting a tough encounter today.
"It will be a hard match (today) because the guys from Chinese Taipei play good doubles," said Susanto.