Australias 4x100m freestyle relay team claimed Rio Olympic gold on Saturday night in a world record time.The team of Emma McKeon, Brittany Elmslie, Bronte and sister Cate Campbell ensured Australia defended its Olympic title.They clocked three minutes 30.65 seconds, bettering Australias previous world-best mark of 3:30.98 set at the 2014 Glasgow Commonwealth Games.Earlier, Australias Mack Horton secured the nations first gold medal at Rio, winning the 400m freestyle.The 20-year-old is the first Australian since Ian Thorpe in 2004 to win the Olympic 400m freestyle crown.Horton clocked three minutes, 41.55 seconds to claim the stirring win ahead of defending champion Sun Yang (3:41.68) of China.While earlier Sunday morning Australias archers won the nations first medal of the Games, taking a surprise bronze in the teams event.Taylor Worth, Ryan Tyack and Alec Potts beat China in the bronze medal match to put Australia on the medal table early at the Sambodromo on the opening day of competition.But cycling hope Richie Portes Games are over after he crashed out in the road race.After finishing fifth in the Tour de France last month, Porte arrived in Rio as a medal chance in both the road race and time trial.The Tasmanian is now out of Wednesdays time trial after breaking his collar bone when he crashed on the second of three descents from the steep Vista Chinese climb, injuring his right shoulder.He was well placed with less than 40km left in the brutal 237.5km race, sitting in the main peloton as it chased a leading group of five riders.No Australians featured among the top finishers, with Belgian Greg van Avermaet claiming the gold.Conditions were also tough for the rowers, while Australia had an unlikely pair of Olympic history makers in John Millman and Melissa Tapper and the team sports made solid starts.The rowing regatta opened in high winds and choppy waters at Lagoa Stadium, with Australias gold medal favourite Kim Brennan describing the course as unrowable.Brennan lost her first single scull race in two years when she finished third in her heat but is through to Tuesdays quarter finals.Theyve never raced us in these sort of conditions before, its unprecedented to race a race in cross white cap conditions, said Brennan.Normally this would be deemed unrowable.Teammate Rhys Grant also reached the quarters of the mens single scull, while mens pair Spencer Turrin and Alex Lloyd won their heat.Andrew Bogut led Australias basketballers?to an 87-66 thrashing of France, while the womens side came from behind to open their Olympics with a win over hosts Brazil.The mens hockey side scraped home with a 2-1 win over New Zealand, but the womens side were left disappointed as they fell 2-1 short against great Britain in a tough hit out.Australias womens rugby team dominated in their opening day, defeating Columbia 53-0 in the biggest victory of the day, while they also outclassed Fiji 36-0 in a six-try rout.World No.75 Millman recorded the first double bagel in Olympic tennis history, thrashing hapless Lithuanian Ricardas Berankis 6-0 6-0 in the first round. 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