Summer
On 7 June, Australia started 11/8 favourite for the Derby ahead of Kingston Hill (15/2) and the Godolphin runner True Story (8/1) in a field of sixteen runners. Australia was calm in the parade ring and on the way to the start and was the final horse to be loaded into the stalls before the race. Once underway the 50/1 outsider Our Channel took the early lead and set a strong pace from Kingfisher, with Kingston Hill next as Joseph O'Brien settled Australia towards the rear of the field. Approaching the final turn Australia made rapid progress on the outside and moved into contention early in the straight as Kingston Hill took the lead. Australia overtook Kingston Hill approaching the final furlong and won decisively by one and a quarter lengths. After the race, Aidan O'Brien said: "Listen, a long time ago we thought he was very special.We wanted to be here with him, but you can never be sure because there are so many variables. Listen, things can go wrong so big credit to everyone at home". Joseph O'Brien commented, "horses don't come any easier to ride than this one. He's the best."
Three weeks after his win at Epsom, Australia contested the Irish Derby at the Curragh in an attempt to follow in the footsteps of both his parents by winning both countries' classics. Epsom Derby second Kingston Hill was withdrawn from the race because of the firm ground, which meant Australia had little serious opposition and started at odds of 1/8. In what was described as "little more than an exercise routine" Australia won very easily by two and a half lengths from his stable companion Kingfisher with Orchestra a further two and a half lengths back in third. After the race Aidan O'Brien confirmed Australia would be targeted at the International Stakes and Irish Champion Stakes as "he'd have no problem going back to 1m 2f."
After a break on 20 August 2014 Australia travelled to York Racecourse to compete in the International Stakes against older horses for the first time. Prior to the race there was speculation as to who would ride Australia as Joseph O'Brien would be unable to make the 8 st 12 lb required and Ryan Moore was booked by Sir Michael Stoute to ride Telescope.
Three days before the race it was revealed Joseph O'Brien was going to make the weight, the first time he would ride under 9 st since riding Magician in the Dubai Sheema Classic. Despite a strong field including Telescope the Hardwicke Stakes winner, Mukhadram the Eclipse Stakes winner and French Derby winner The Grey Gatsby, who had also won the Dante Stakes over the course and distance earlier in the year, Australia started the 8/13 favourite. Stablemate Kingfisher was runner as a pacemaker. Like at Epsom, Australia was last to load and after sitting at the back with The Grey Gatsby they both ran on in the last three furlongs. Australia went on to win, becoming the first horse to complete the Derby-International double in the same season since Sea the Stars.
