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Justin Rose hit a hole-in-one on the par-three fourth hole.
Katie Ledecky set an Olympic record of eight minutes, 12.86 seconds.
Superstar gymnast Simone Biles won gold in the Women's Individual All Around Final.
Reigning men's tennis singles champion Andy Murray progressed to the quarter-finals.
Fiji players and staff huddle as they win gold in the men's rugby sevens.
Actor Matthew McConaughey attends the evening swim session.
Canada's Penny Oleksiak, 16, shared the women's 100m freestyle gold with Simone Manuel.
American Simone Manuel became the first black female swimmer to win an Olympic title.
Michael Phelps demolished the field in the 200m individual medley to claim his 22nd Olympic gold.
Grainger (R), 40, has now won five Olympic medals - four silvers and a gold - across five different Games.