Dastmalchi won the 1992 World Series of Poker (WSOP) main event, which is his largest tournament win at $1 million. He again made the final table of the main event in 1995, finishing fourth.
Dastmalchi was involved in a legal dispute in 1999 with Binion's Horseshoe after the new management would not let him cash in over $800,000 in chips he had won prior to a legal battle in which Becky Binion Behnen replaced Jack Binion as the head of the casino. The Nevada Gaming Commission ultimately ruled the chips should be cashed.
In his career, Dastmalchi has won three WSOP bracelets.
Although he rarely plays in tournaments any more, his total live tournament winnings exceed $1,800,000 as of 2009, with his ten cashes at the WSOP accounting for $1,600,760 of those winnings.