|Date of birth||31 December 1979|
|Place of birth||Budapest, Hungary|
|Height||5 ft 11 in (1.80 m)|
|2003–2004||Videoton FC Fehérvár||42||(12)|
|2009–2010||Kansas City Wizards||10||(2)|
|2011–2012||Budapest Honvéd FC II||7||(0)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 22 April 2012.
‡ National team caps and goals correct as of 5 April 2009
Hercegfalvi joined the youth academy of storied Hungarian team Honvéd at the age of 6, and played all the way through their system before making his first team appearance in 1998. He played at Honvéd until 2003, and subsequently enjoyed stints with rivals Videoton Székesfehérvár, Lombard-Pápa TFC, and Czech side Slavia Prague, before rejoining Honvéd in 2006. In total, Hercegfalvi spent more than 20 years at Honvéd, and made over 150 appearances for the club.
Hercegfalvi joined the Kansas City Wizards on 28 July 2009. Hercegfalvi missed most of the 2010 season due to a torn ACL suffered in a 2-1 friendly win over AC St. Louis and was released at the conclusion of the 2010 season.
Hercegfalvi has also appeared three times for the Hungarian national football team.