Indonesia U21 triumphed over Thailand U21 with a 3-1 scoreline in a Southeast Asian derby at the World Championship U21 on August 30, 2025. The 17:00 match was a tightly contested affair that ultimately saw Indonesia's defensive grit and timely scoring overcome Thailand's speed and technique. The familiar rivals traded blows in a high-energy first set, setting the tone for a physical match. Indonesia's block began to find its timing as the match progressed, slowing down Thailand's quick middle attacks and forcing them into more difficult shots. Thailand's renowned fighting spirit kept them in the match, but a series of service errors at crucial junctures in the fourth set handed Indonesia the victory. The result was crucial for both teams' aspirations in the group, with Indonesia gaining a valuable edge in the head-to-head standings. The match highlighted the growing depth and competitive nature of Asian volleyball at the youth level.