People who applied for the second round of tickets for the London 2012 Olympics are due to discover whether their application has been successful.
Some 2.3 million tickets were put up for sale on Friday for 10 days on a first-come, first-served basis on London 2012's website.
Applicants will find out whether they have been successful within 24 to 48 hours of applying.
Tickets for 310 sessions went on sale, 44 of which were medal events.
These include archery, basketball, fencing, judo and synchronised swimming and table tennis.
Some half a million tickets are priced at £20 or less. A further one million tickets are priced between £20 and £50.
Payment will be taken once the sale closes at 1800 BST on 3 July.
The London Organising Committee of the Olympic Games (Locog) said: "Broadly speaking, those who applied first, on Friday morning, will be those who hear first."
Tickets had been available in 20 sports - about 1.7 million for football and 600,000 for other sports, including archery, hockey, football, judo, boxing and volleyball, among other sports.
Fewer than half of those who applied got tickets in the first round as demand outstripped supply in many events - massively in some cases, such as the men's 100m athletics final where more than one million tickets were requested.
Those who were successful in the first ballot, held from May to June, will get their own second chance to buy from 0600 BST on 8 July to 1800 BST on 17 July.
One applicant, Andy Pritchard, from Bangor, Gwynedd, contacted the BBC to say he was unsuccessful in his application for second round tickets, an experience which he found "galling".
He said: "I was on the application website bang on 0600 on Friday to make my application and thought I had got tickets to three sessions."
"As they were supposedly first come, first served, I had some confidence that I had been successful. But today I received an e-mail saying I had been unsuccessful and will not be going to the games, which I just found galling.
"I am completely unimpressed and feel let down by the ticketing arrangements. Surely in this day and age a computer system can be devised to select one seat per person. Now I have no tickets for myself or my son."
Locog has also said its predictions indicate more than one million tickets will become available between December 2011 and the start of the Games.
These will come through returns, and as the final seating plans for the venues are finalised.
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