This year's SEA Games will be held in the Cambodian capital until May 17.
Eleven nations are competing for metals: host country Cambodia, Thailand, Indonesia, Malaysia, the Philippines, Singapore, Vietnam, Brunei, Laos, Myanmar, and Timor-Leste.
Thailand is aiming to win 164 of 583 gold medals in the regional competition.
Other highlights on Wednesday include:
The SEA Games are being broadcast live on Channel 5, 9 MCOT and NBT digital TV channels, as well as the T Sports 7 application.