The US Open and the Australian Open.
You don't get paid, but you do receive prize money.
There are several resources online that cover this topic. Go to the US open tennis website, then navigate to About -> History -> Prize Money
About $1.83 million dollars.
1,120,000 Pound
The amount of prize money varies by year, but you can check on the tournament's web site to find out what it is now.
$2,100,000
At US Tennis Open places.
US Open Tennis - 2002 was released on: USA: 25 August 2002
Prince
Australian French US (The Championships) Wimbledon
The US Open is, as always, at the National Tennis Center in New York, NY.