Vietnam's tennis duo Minh Quan-Quang Huy beat top-seeded Thai pair Sanchai Ratiwatana and Sonchai Ratiwatana in the men's doubles quarters at the South East Asian Games in Indonesia on Friday.
The Vietnamese pair were considered the underdogs before the match because the Thai twins used to be ranked 39th in the world in 2008.
The Thai players showed how strong they were in the first set by thrashing the Vietnamese rivals 6-1.
The Vietnamese pair refused to give up and fought back to take the second set 6-4.
In the decider, Quan-Huy led 3-0 before their opponents showed their mettle and stormed to a 5-3 lead. But the Vietnamse kept their cool and restored parity before prevailing The match was not over.
The Vietnamese players kept calm and made it 5-5 before winning the set 10-6 to book a berth in the semifinals.