Azarenka takes on Begu in Olympics
Belarus' Victoria Azarenka is the top seed in the Olympic tennis women's singles draw and she will face Romania's Irina-Camelia Begu in round one at Wimbledon.
Second seed and Wimbledon runner-up Agnieszka Radwanska of Poland meets big-hitting German Julia Goerges.
Wimbledon champion Serena Williams is seeded fourth and faces former world number one Jelena Jankovic from Serbia in a standout first-round clash, with sister Venus taking on ninth seed Sara Errani from Italy.
Both Williams sisters are in Azarenka's half of the draw, while in the bottom half, third seed Maria Sharapova faces Israel's Shahar Peer in round one.
Of the three British representatives, Anne Keothavong has the toughest task after being drawn against eighth seed and former world number one Caroline Wozniacki.
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 Melzer and Alexander Peya, while fellow British duo Colin Fleming and Ross Hutchins meet Frenchmen Richard Gasquet and Julien Benneteau.
Defending champion Wawrinka and 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, Goerges and Anna-Lena Gronefeld.
Top seeds Liezel Huber and Lisa Raymond of the US were given a bye while defending champions the Williams sisters are unseeded and will take on Sorana Cirstea and Simona Halep of Romania in round one.
