Of the three British representatives in the Olympic tennis women's singles draw, Anne Keothavong has the toughest task after being drawn against eighth seed and former world number one Caroline Wozniacki at Wimbledon.
British number one Heather Watson meets Spain's Silvia Soler Espinosa while Elena Baltacha takes on Hungary's Agnes Szavay, who has played only one match in more than a year because of a back injury and does not even have a world ranking.
In the men's doubles, Andy and Jamie Murray will play Austrian pair Jurgen Melzer and Alexander Peya, while fellow British duo Colin Fleming and Ross Hutchins meet Frenchmen Richard Gasquet and Julien Benneteau.
Defending champion Stanislas Wawrinka and Roger Federer take on Japan's Kei Nishikori and Go Soeda, while top seeds Bob and Mike Bryan of the US face Thomaz Bellucci and Andre Sa of Brazil.
In the women's doubles, Watson and Laura Robson were handed a tough draw against fifth seeds Angelique Kerber and Sabine Lisicki of Germany, with Baltacha and Keothavong meeting another German pair, Julia Goerges and Anna-Lena Gronefeld.
Top seeds Liezel Huber and Lisa Raymond of the US were given a bye while defending champions Serena and Venus Williams are unseeded and will take on Sorana Cirstea and Simona Halep of Romania in round one.