Singapore's synchronised swimmers have won the country's first-ever SEA Games gold medal in the sport on Wednesday evening.

In a tense night, the Singaporean swimmers were not the only ones holding their breaths at the SEA Games team free routine final.

All eyes were on the scoreboard, waiting to see how the Malaysian team - third to perform - scored for their performance at the OCBC Aquatic Centre.

The partisan crowd were already cheering passionately when it was announced that Malaysia, who swept all seven golds from 2001 to 2011 at the SEA Games, had finished second.

With a final score of 150.8445, Singapore dethroned reigning champions Malaysia and ended their search for the gold while Malaysia scored a total of 146.5204 points.

The technical routine scores were added to tabulate the ranking to give Singapore a winning margin of 4.3241.