Did the player have a really high score?
It's not impossible to have a win record like that, especially if you exploit the VERY time consuming saving glitch so that you have an almost non-existant loss record. A more likely answer is that the account was hacked with tons of money. With the hackers I've talked with on Kongregate, they can change the money, score, wins/losses, and possibly even the cards. They can also change the amounts of quantum they have during a match, but this often causes a desync and quick-expulsion from the game, giving both players an instant win.