The youngest golfer to enter is 13-year-old Tommy Mou of Taiwan, who is now living in Bradenton, Fla. The oldest is 81-year-old Dick Lynch, a professional from Milwaukee, Wis.
Overall, the United States Golf Association received entries from golfers in all 50 states and 58 foreign countries. To be eligible, the player must have at least a 1.4 Handicap Index, or be a professional.
The number of fully exempt golfers will increase with the inclusion of the top 50 players from the World Rankings, the top 10 money leaders on the PGA Tour and the top two money leaders on the European PGA Tour at the end of May.
An Open champion receives a full exemption into the field for the next 10 years.
Local qualifying at more than 100 sites will begin May 12 with sectional qualifying at 13 sites being held June 7-8.
Some of the players already exempt include Tiger Woods, David Duval, Adam Scott, Ian Poulter, Phil Mickelson and Corey Pavin.