The last night of track and field turned into a Thai parade, with their sprinters providing the perfect final act with a men's and women's 4x100m relay double.
Thailand edged past Singapore, who have led since day one, on the medals tally with 71 golds to 70 late on Friday, with four days of competition still to go.
Sunisa Khotseemueang played a starring role by winning all seven events of the heptathlon as Thailand took seven out of yesterday's 10 athletics titles to reach 17 overall.
Earlier Kunanon Sukkaew outsprinted Vietnam's Quach Cong Lich on the back straight to win a thrilling men's 400m in a Games record 46.00sec.
"I didn't expect it. I expected it to be in the one, two or three position but not the gold medal. I got the gold medal and I am very proud," Kunanon said in Thai after the race.
Subenrat Insaeng hurled a new SEA Games mark of 59.56 in the women's discus and Thailand also won the women's high jump and the men's long jump.
Former world champion Ratchanok Intanon led Thailand to gold in the women's team badminton with an emphatic 3-0 victory over Malaysia.
Ratchanok's first-up 21-13, 21-14 win over Lim Yin Fun in 36 minutes set the tone as the Thais wrapped it up quickly, spending less than two hours on court.
Thailand's Jutatip Maneephan won the women's criterium cycling, held in the downtown area of Marina Bay South, and Harrif Saleh of Malaysia took gold in the men's race.
Singapore interrupted a Thai golf sweep when they won the men's team title, but overall it was a flat day for the hosts who added four golds to their overnight tally of 66.