Liam Broady has been selected in the men's singles event at Tokyo 2020 while American Coco Gauff has been forced to withdraw from the women's draw after testing positive for Covid-19.
Broady was offered a spot by the International Tennis Federation based on his world ranking of 141.
The British number five joins Andy and Jamie Murray, Neal Skupski, Joe Salisbury and Heather Watson.
Gauff said she was "so disappointed" at having to pull out of her Games debut.
"It has always been a dream of mine to represent the USA at the Olympics and I hope there will be many more chances for me to make this come true in the future," said the 17-year-old, who is coming off a fourth-round run at Wimbledon.