- Started Rowing
- Gary Roberts
2013 U-23World Rowing Championships - Gold, men's eight
2014 U-23 World Rowing Championships - Gold, men's eight
2017 sees Isaac return to the men's eight. He will compete at World Cup II, World Cup III, and Henley Royal Regatta.
Isaac is a member of the men's eight that claimed sixth place at the Rio 2016 Olympic Games. Rio was Isaac's first Olympic Games, having qualified the eight for Rio at the 2015 World Rowing Championships in Aiguebelette where the crew finished in fourth place. In 2013 and 2014 Isaac was an U23 World Champion in the men’s eight.
Isaac was born in Auckland and began his rowing career at Edgewater College in 2007 and is currently a member of the Auckland Rowing Club.
Grainger first took up rowing at Auckland's Edgewater College in 2007. He made his international rowing debut in the New Zealand men's U23 eight, and what an excellent start to his rowing career, winning gold at the 2013 U23 World Rowing Championships and the crew went onto back up that performance in 2014.