Marston, the teenager from the West Auckland Aquatics club, qualified seventh fastest and finished in the same placing in the final of the 400m freestyle in 4min 14.18sec; it was her second final in her World Cup debut.
Both Ingram and Maston will head to Beijing for the next round of the World Cup on November 8-9, where they will be joined by Queensland-based Cantabrian Cameron Simpson.
Finals results: 100m backstroke: Rachel Goh (AUS) 57.30sec, 1; Shiho Sakai (JPN) 57.69sec, 2; Grace Loh (AUS) 58.31sec, 3. Also: Melissa Ingram (NZL) 59.43sec, 5.
400m freestyle: Blair Evans (AUS) 4min 1.15sec, 1; Kylie Palmer (AUS) 4min 3.14sec, 2; Ophelie Etienne (FRA) 4min 5.01sec, 3. Also: Ingram 4min 11.05sec, 5; Jessica Maston (NZL) 4min 14.68sec, 7.