Samuels raced impressively throughout, emerging from the water in touch with the leaders and riding within herself on the bike, always keeping an eye on Daniela Ryf (SUI).
The Wanaka athlete then moved into her work on the run, immediately moving clear of a tiring Ryf to post an impressive result in her second race back after having surgery to remove her appendix.
While Nicola Spirig (SUI) won the day from Aileen Morrison (IRE) and Barbara Riveros Diaz (CHI), the challenge from the Swiss for a top eight position in the nation rankings never materialised with Ryf no match for the kiwis, finishing well back in the field, confirming New Zealand and Germany as the final two nations to earn the three spots in London.
ITU world triathlon championship
Madrid, Spain
Elite Women:
1 Nicola Spirig (SUI) 2:06:35
2 Aileen Morrison (IRL) 2:06:38
3 Barbara Riveros Diaz (CHI) 2:06:40
4 Anne Haug (GER) 2:06:43
5 Rachel Klamer (HOL) 2:07:05
6 Ainhoa Murua (ESP) 2:07:18
7 Vicky Holland (GBR) 2:07:19
8 Alexandra Razarenova (RUS) 2:07:32
9 Andrea Hewitt (NZL) 2:07:38
10 Liz Blatchford (GBR) 2:07:43
Plus
15 Nicky Samuels NZL 2:08:22