Republic of Ireland's first ever appearance at the finals ended in defeat as Steph Catley's second-half penalty earned co-hosts Australia a 1-0 win in Sydney.
Australia had suffered a blow before the game when captain Sam Kerr was ruled out of their opening two Group B matches – against Ireland and Nigeria – due to a calf injury sustained in training.
The 29-year-old, Australia's all-time record scorer, hopes to be fit for the final group match against Canada on July 31. Ireland frustrated the Matildas in the first half but their good work was undone when Marissa Sheva pushed Hayley Raso and Brazilian referee Edina Alves point to the spot.
Stand-in captain Catley converted from the spot in the 52nd-minute to seal three points for Australia. “It's incredible to get the win, I think this is the longest build-up to a game in my entire life,” Catley told reporters. “Losing a player like Sam, probably the best player in the world and her as a person, obviously we were heart-broken.