tournaments won vs entered

[BigAlK]

I don't know of any site like that although I've seen the question raised before and nobody could come up with anyplace to get the events entered data. (Wins, in-the-money, and amount of winnings is, of course, trivial to find). If you're hoping to apply some math to get an exact chance based on your coin-flipping scenario that might be tough. But consider the size of the fields over the last several years in the WSOP events. If you ignored how many Hellmuth (for example) entered (assume he entered all of them even though it is physcially impossible) I'd bet the number he won (or whatever measure you used) would be far better than chance. I'd assume the number of entrants would be available some where. For sure you could get this year and I believe the year before from data on the WSOP site.