Hynd strikes gold at Rio 2016
The Ashfield swimming sensation led from the front to finish first in 4:21.89 in the event he won silver in London 2012.
His brother Sam won the same event at the 2008 Games in Beijing.
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Hide AdAfter the race, Hynd said: “I don’t think there has been a day where I have not thought about London and how disappointed I was not to get the gold so it makes it all worth it now.
“I’m so happy with the time. I wanted to go under 4:20 if I’m honest but a world record, I’m happy with that.
“I’ve worked so hard for that, I can’t wait to get on the podium and get my medal.”