Australia's 4x100-meter women's freestyle relay team has done it again, breaking its own world record on the opening night of the swim program at the Commonwealth Games.
That broke the mark of 3:30.65 the Aussies - including the Campbells and McKeon - clocked at the Rio de Janeiro Olympics in 2016.
The Australian cycling team went to the Olympics two years ago aiming to win at least three golds, but they returned home with none and instead it was Britain who dominated.
Australia's first medal of the games, however, was won by Tasmanian triathlon competitor Jake Birtwistle, who took silver on Thursday afternoon, beaten only by South Africa's Henri Schoeman. "I don't think I've quite come down yet". "I knew that this time it could have been me if I just swam the race a little bit better".
"I probably feel more emotion here than in Rio because the whole crowd is cheering for you", Horton said.
Australia won eight of nine golds in the men's 400m freestyle from 1970 to 2002 - but lost out to Scotland's David Carry in 2006 and Canada's Ryan Cochrane in 2010 and 2014. "That didn't happen so much in Rio".
Canada's Alexia Zevnik had given her team a flying start before Bronte Campbell took over and McKeon then pulled away from Olympic 100m freestyle champion Penny Oleksiak to set up Cate Campbell's flying finish.
"Rio is cool. But home crowd is always going to win - having 10,000 people cheering for you is pretty unreal".
Teenager Titmus made a late charge but was tipped out by Ruck.
England also claimed two gold medals on the opening night with Aimee Wilmott denying Hannah Miley's bid for a Scottish record three consecutive 400m individual medley gold medals and James Wilby dethroning Scottish defending champion Ross Murdoch in the 200m breaststroke.
England also had to settle for silver in the men's team sprint as New Zealand won in 42.877 seconds.
"I've raced against Hannah in every meet and I've been second every time", Willmott said.