The main qualifying criteria were the ATP and WTA ranking lists as of 11 June 2012.
The players entering were formally submitted by the International Tennis Federation.
The ATP and WTA rankings were based on performances from the previous 52 weeks, and there were several tournaments in the two-month period between the time of the rankings being frozen for entry and the beginning of the tennis events at the Olympics.
Players must have also made themselves available for two Fed/Davis Cup events from 2009–2012, one of which must have taken place in 2011–2012, and had a good standing with their National Olympic Committee.
[4] † Romina Oprandi has previously represented Italy, making her ineligible for Switzerland.