Marcus Fraser fired a stunning 63 and Justin Rose made the first hole-in-one in Olympic history on an eventful opening morning of the Men's Golf Competition in Rio de Janeiro.
World Number 90 Fraser was at the Games due to withdrawals from some of his fellow Australians and he grabbed his opportunity with both hands to set the clubhouse target at eight under.
Fraser was nearing the end of his round as Rose prepared to play the fourth and the Briton holed his tee-shot to spark wild celebrations at the Olympic Golf Course.
Golf was making its return to the Olympics for the first time in 112 years and local favourite Adilson da Silva was handed the honour of hitting the opening tee-shot.
It was playing partner Graham DeLaet who set the early pace, however, the Canadian trying to defend the title for his country after George Lyon won gold in 1904 in St Louis.
The 34 year old made six birdies with a single dropped shot in his 66 to set the early clubhouse target but he was soon passed by Maybank Championship Malaysia winner Fraser.
He took advantage of the par five first and, after a bogey on the next, went on a stunning run of four birdies.
An approach to four feet and excellent tee-shot set up gains on the third and fourth before the putter got hot as the three-time European Tour winner holed from 23 and 25 feet on the fifth and sixth.
A beautiful approach to the par five tenth set up another birdie and a further gain on the 13th had Fraser six under. The final three holes all offer up birdie opportunities and the 38 year old capitalised on the 16th and 18th to open up a three-shot gap to DeLaet.
Thomas Pieters was then at four under after he used his distance off the tee to his advantage in an opening 67.
The Belgian birdied the par five first, tenth, and last while also driving the par four third for another gain. He also made birdies on the sixth and ninth with dropped shots on the eighth and 14th.
Spaniard Rafa Cabrera Bello was also at four under after seven holes, a shot clear of Pieters' team-mate Nicolas Colsaerts and South Korea's Byeong-hun An.
An - whose parents both won Olympic medals in table tennis in 1988 - turned in 31 after recovering from a three-putt bogey on the first but came home in 37.
Colsaerts was level par after 14 holes but birdied the 15th, 16th and last to move up the leaderboard.
Rose, Open champion Henrik Stenson of Sweden, Germany's Martin Kaymer and Frenchman Grégory Bourdy were all also at three under out on the course.
