Mack Horton of Australia celebrates after winning a gold medal.
That trio and Emma McKeon clocked a time of 3 minutes, 30.5 seconds, lowering the world record of 3:30.65 that Australia (with the Campbell sisters and McKeon part of the team) set in winning Olympic gold at Rio de Janeiro in 2016.
But they fell off after 1000m and the Aussies powered through to catch the Kiwis on the last lap and seal the win by almost 10 seconds.
"We weren't expecting that at all tonight", Bronte Campbell told reporters. "My coach said 'the atmosphere out there is electric, go out, soak it up.' I think that is what we have done".
"I'm really grateful that I got that final spot", Jack said.
"I think there is something to be said for home-crowd advantage, we've never had that before, and now we can see what it does for us".
Under a mostly clear night sky at the open-air stadium, Ruck held off a fast-charging Ariarne Titmus of Australia in the 200-meter freestyle.
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Australia smashed world records in swimming and cycling on day one of the Commonwealth Games as they rebounded quickly from hurdler Sally Pearson's shock pull-out on Thursday.
Moments later, Australia had its second gold, with the women's 4,000m pursuit team scoring a convincing win over New Zealand in the final.
Earlier, Horton again saluted for Australia, taking out the 400m freestyle with a powerful finish down the stretch under the night sky at the Optus Aquatic Centre.
The 17-year-old Ruck went out hard and touched in a Commonwealth Games record time of 1:54.81 to pip Titmuss by a fingernail.
Canada finished second, almost four seconds behind. Australia's Pearson, the 100m hurdles world champion and a Gold Coast resident, earlier said she was in tears when she realised she had to withdraw, but added: "My health comes first". "I was like, "omigosh", and then I looked up at the board and I saw that I'd won". Wilmott's effort was then backed up by Thomas Hamer and Eleanor Robinson in the S14 200m freestyle and S7 50m butterfly respectively, before James Wilby stormed home over the last 50 to capture the men's 200m breaststroke. Horton recorded a time of 3:43.76, with McLoughlin following in 3:45.21.
"I've raced against Hannah in every meet and I've been second every time", Willmott said.