In the earlier semi-finals, Ng sailed past Kirsten Penny of England and needing only two games to beat seond seed Penny, 246-215 and 231-191 to advance to the finals and challenge Guerra.
"I had to fight my way up from third but it did mean that I got used to the lanes for the finals and Remy really helped me make lots of adjustments, so many that I had to write them down to remember them, said Ng. "It has been a great experience working with Remy. This is my first world title and I'm a record holder as well!"
Ng's victory is Singapore's second in the World Cup after Jasmine Yeong-Nathan, who won the women's title in Hermosillo, Mexico in 2008.
The newly-crowned champion had topped the the four blocks of 5 games each in the qualifying rounds to advance to the top 24 round in which Ng also retained pole position to move into the top 8 round-robin finals.
Aumi Guerra topped the round-robin with 8457 ahead of Kirsten Penny in second wth 8445. Perfect gamer and World Youth gold medlaist, Danielle McEwan of USA missed the stepladder finals in fourth with 8158.