The next phase of London 2012 Olympic ticket sales started at 0600 BST on Friday 8 July.
Tickets are available to the 700,000 people who applied in the first round and received some or all of their original request.
Only football, volleyball and freestyle wrestling tickets remain and will be sold on a first come, first served basis.
Last week, 150,000 people who had missed out in the first round, snapped up more than 750,000 tickets in the first phase of the second round.
Which tickets are still available?
Football, volleyball and freestyle wrestling.
Men's and women's football has by far the most tickets available with more than 1.5 million up for grabs. Some 40,000 are available for men's and women's volleyball sessions at Earls Court and about 8,000 for freestyle wrestling at the Excel Centre.
A full list of available sessions and price categories has been published on the official 2012 website.
Where can I see football?
Football is spread around the UK: Hampden Park in Glasgow, St James' Park in Newcastle, Old Trafford in Manchester, City of Coventry Stadium, Millennium Stadium, Cardiff and Wembley Stadium in London.
Applicants will find out whether they have been successful within 24 to 48 hours of applying. Payment will be taken once the sale closes.
Will more tickets be available at a later date?
Any tickets left after the first two rounds should start to be released for sale to the British public from December until the Games start.
This could be about a million tickets - the exact number of seats available will become clearer from contingency, returns and the fitting out of venues.
I've heard people in other countries already have tickets - how's that happened?
As at every other Olympic Games, the National Olympic Committee (NOC) of each participating country gets an allocation of tickets. It has emerged that some countries' authorised resellers are legitimately selling these tickets online.
Some British people have been able to buy tickets this way although Locog has warned UK fans to beware of bogus and unauthorised websites when searching for tickets from overseas sources.
It urged them to use the London 2012 website checker to verify if the seller is genuine.
Are there any other ways to get tickets?
Premium corporate hospitality packages are available through Prestige Ticketing Ltd for UK and European Economic Area (EEA) companies and residents. Jet Set Sports is offering premium hospitality packages for all over overseas markets.
Thomas Cook is providing short UK break packages that include event tickets, accommodation and transport.
What if I have ended up with more tickets than I want?
A system is being set up for people with unwanted tickets to resell them at face value, although this won't be available until next year, meaning a long wait before being reimbursed.
How many people were successful in the initial ballot?
About 700,000 applicants got tickets, meaning 1.2 million missed out.
Will there be any free events to see?
Yes, there will be free events such as the marathon and road cycling where you won't need a ticket apart from for the final section. However, it is likely London 2012 will ticket the Olympic Park to control crowd numbers.
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