Prince Harry, who hooked up with members of Brazil's beach volleyball team in Rio de Janeiro earlier this year, will watch the final of the women's event at Horse Guards Parade on August 8.
And with Brazil one of the fancied teams for the gold medal, the Prince may get a chance to be reunited with some of the friends he made on Flamengo beach.
The Prince, the Duke and the Duchess are all ambassadors for Team Britain, and will between them act as cheerleaders on all but two of the 16 days of competition, the Daily Telegraph reported.
A St James's Palace spokesman said the trio had picked out events in which they had a personal interest and also "to support Team GB as much as possible".
Their duties will start on Friday, when all three of them will be at the opening ceremony after attending a reception at Buckingham Palace, hosted by the Queen, for heads of state and government and other dignitaries, including Michelle Obama, who arrives in London on Thursday.
Prince Harry will see his friend, Usain Bolt, who he "beat" by cheating in a race with him in Jamaica, run in the 100m final on August 5 and will cheer on Tom Daley and his partner, Pete Waterfield, in the 10m platform synchronised diving final.
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Prince William and wife Kate will visit Wimbledon together for the Olympic tennis, and between them they will also take in football, gymnastics, cycling and synchronised swimming.
The Duchess will support swimmer Rebecca Adlington when she goes for gold in the 800m freestyle, as well as watching the Britain's women's hockey and the sailing in Weymouth.
There is no doubt where the threesome's loyalties lie, as they will make a total of four visits to the equestrian centre in Greenwich to support Zara Phillips and her Britain team-mates. The Prince of Wales and the Duchess of Cornwall will join them there on Monday and Tuesday.
All three younger members of the Royal family will also pay joint visits to the Athletes' Village, while Prince Harry and the Duchess will be at the closing ceremony on August 12.
The Duke's RAF Search and Rescue duties mean he will miss the second week of the Games, including the closing ceremony.